diff --git a/src/structs/ContentAny.js b/src/structs/ContentAny.js
index 3ab2dc5f..ba7a1b77 100644
--- a/src/structs/ContentAny.js
+++ b/src/structs/ContentAny.js
@@ -76,9 +76,9 @@ export class ContentAny {
    */
   delete (transaction) {}
   /**
-   * @param {StructStore} store
+   * @param {Transaction} _tr
    */
-  gc (store) {}
+  gc (_tr) {}
   /**
    * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder
    * @param {number} offset
diff --git a/src/structs/ContentBinary.js b/src/structs/ContentBinary.js
index 2708f53b..a376dbbc 100644
--- a/src/structs/ContentBinary.js
+++ b/src/structs/ContentBinary.js
@@ -66,9 +66,9 @@ export class ContentBinary {
    */
   delete (transaction) {}
   /**
-   * @param {StructStore} store
+   * @param {Transaction} _tr
    */
-  gc (store) {}
+  gc (_tr) {}
   /**
    * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder
    * @param {number} offset
diff --git a/src/structs/ContentDeleted.js b/src/structs/ContentDeleted.js
index dc9b776c..102bcdfa 100644
--- a/src/structs/ContentDeleted.js
+++ b/src/structs/ContentDeleted.js
@@ -68,13 +68,13 @@ export class ContentDeleted {
   }
 
   /**
-   * @param {Transaction} transaction
+   * @param {Transaction} _transaction
    */
-  delete (transaction) {}
+  delete (_transaction) {}
   /**
-   * @param {StructStore} store
+   * @param {Transaction} _tr
    */
-  gc (store) {}
+  gc (_tr) {}
   /**
    * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder
    * @param {number} offset
diff --git a/src/structs/ContentDoc.js b/src/structs/ContentDoc.js
index 15836f51..8491272b 100644
--- a/src/structs/ContentDoc.js
+++ b/src/structs/ContentDoc.js
@@ -110,9 +110,9 @@ export class ContentDoc {
   }
 
   /**
-   * @param {StructStore} store
+   * @param {Transaction} _tr
    */
-  gc (store) { }
+  gc (_tr) {}
 
   /**
    * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder
diff --git a/src/structs/ContentEmbed.js b/src/structs/ContentEmbed.js
index 46fba375..4cb2f922 100644
--- a/src/structs/ContentEmbed.js
+++ b/src/structs/ContentEmbed.js
@@ -69,9 +69,9 @@ export class ContentEmbed {
    */
   delete (transaction) {}
   /**
-   * @param {StructStore} store
+   * @param {Transaction} _tr
    */
-  gc (store) {}
+  gc (_tr) {}
   /**
    * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder
    * @param {number} offset
diff --git a/src/structs/ContentFormat.js b/src/structs/ContentFormat.js
index 631e7755..d79aa885 100644
--- a/src/structs/ContentFormat.js
+++ b/src/structs/ContentFormat.js
@@ -77,9 +77,9 @@ export class ContentFormat {
    */
   delete (_transaction) {}
   /**
-   * @param {StructStore} _store
+   * @param {Transaction} _tr
    */
-  gc (_store) {}
+  gc (_tr) {}
   /**
    * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder
    * @param {number} _offset
diff --git a/src/structs/ContentJSON.js b/src/structs/ContentJSON.js
index 29b2f754..17591756 100644
--- a/src/structs/ContentJSON.js
+++ b/src/structs/ContentJSON.js
@@ -73,9 +73,9 @@ export class ContentJSON {
    */
   delete (transaction) {}
   /**
-   * @param {StructStore} store
+   * @param {Transaction} _tr
    */
-  gc (store) {}
+  gc (_tr) {}
   /**
    * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder
    * @param {number} offset
diff --git a/src/structs/ContentString.js b/src/structs/ContentString.js
index fa023ef9..a2f5f368 100644
--- a/src/structs/ContentString.js
+++ b/src/structs/ContentString.js
@@ -84,9 +84,9 @@ export class ContentString {
    */
   delete (transaction) {}
   /**
-   * @param {StructStore} store
+   * @param {Transaction} _tr
    */
-  gc (store) {}
+  gc (_tr) {}
   /**
    * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder
    * @param {number} offset
diff --git a/src/structs/ContentType.js b/src/structs/ContentType.js
index 597c8719..13a09cd0 100644
--- a/src/structs/ContentType.js
+++ b/src/structs/ContentType.js
@@ -128,18 +128,18 @@ export class ContentType {
   }
 
   /**
-   * @param {StructStore} store
+   * @param {Transaction} tr
    */
-  gc (store) {
+  gc (tr) {
     let item = this.type._start
     while (item !== null) {
-      item.gc(store, true)
+      item.gc(tr, true)
       item = item.right
     }
     this.type._start = null
     this.type._map.forEach(/** @param {Item | null} item */ (item) => {
       while (item !== null) {
-        item.gc(store, true)
+        item.gc(tr, true)
         item = item.left
       }
     })
@@ -148,9 +148,9 @@ export class ContentType {
 
   /**
    * @param {UpdateEncoderV1 | UpdateEncoderV2} encoder
-   * @param {number} offset
+   * @param {number} _offset
    */
-  write (encoder, offset) {
+  write (encoder, _offset) {
     this.type._write(encoder)
   }
 
diff --git a/src/structs/GC.js b/src/structs/GC.js
index 788cb5ec..8f1d2f9e 100644
--- a/src/structs/GC.js
+++ b/src/structs/GC.js
@@ -3,8 +3,7 @@ import {
   addStruct,
   addStructToIdSet,
   addToIdSet,
-  UpdateEncoderV1, UpdateEncoderV2, StructStore, Transaction, // eslint-disable-line
-  createID
+  UpdateEncoderV1, UpdateEncoderV2, StructStore, Transaction // eslint-disable-line
 } from '../internals.js'
 
 export const structGCRefNumber = 0
@@ -55,20 +54,23 @@ export class GC extends AbstractStruct {
   }
 
   /**
-   * @param {Transaction} transaction
-   * @param {StructStore} store
+   * @param {Transaction} _transaction
+   * @param {StructStore} _store
    * @return {null | number}
    */
-  getMissing (transaction, store) {
+  getMissing (_transaction, _store) {
     return null
   }
 
   /**
-   * @param {number} diff
+   * gc structs can't be spliced.
+   *
+   * If this feature is required in the future, then need to try to merge this struct after
+   * transaction.
+   *
+   * @param {number} _diff
    */
-  splice (diff) {
-    const other = new GC(createID(this.id.client, this.id.clock + diff), this.length - diff)
-    this.length = diff
-    return other
+  splice (_diff) {
+    return this
   }
 }
diff --git a/src/structs/Item.js b/src/structs/Item.js
index c0b281ec..042c971c 100644
--- a/src/structs/Item.js
+++ b/src/structs/Item.js
@@ -634,16 +634,16 @@ export class Item extends AbstractStruct {
   }
 
   /**
-   * @param {StructStore} store
+   * @param {Transaction} tr 
    * @param {boolean} parentGCd
    */
-  gc (store, parentGCd) {
+  gc (tr, parentGCd) {
     if (!this.deleted) {
       throw error.unexpectedCase()
     }
-    this.content.gc(store)
+    this.content.gc(tr)
     if (parentGCd) {
-      replaceStruct(store, this, new GC(this.id, this.length))
+      replaceStruct(tr, this, new GC(this.id, this.length))
     } else {
       this.content = new ContentDeleted(this.length)
     }
@@ -799,9 +799,9 @@ export class AbstractContent {
   }
 
   /**
-   * @param {StructStore} _store
+   * @param {Transaction} _transaction
    */
-  gc (_store) {
+  gc (_transaction) {
     throw error.methodUnimplemented()
   }
 
diff --git a/src/utils/StructStore.js b/src/utils/StructStore.js
index 27cc6126..fdcd7a5a 100644
--- a/src/utils/StructStore.js
+++ b/src/utils/StructStore.js
@@ -198,7 +198,7 @@ export const getItem = /** @type {function(StructStore,ID):Item} */ (find)
 export const findIndexCleanStart = (transaction, structs, clock) => {
   const index = findIndexSS(structs, clock)
   const struct = structs[index]
-  if (struct.id.clock < clock) {
+  if (struct.id.clock < clock && struct.constructor !== GC) {
     structs.splice(index + 1, 0, struct instanceof Item ? splitItem(transaction, struct, clock - struct.id.clock) : struct.splice(clock - struct.id.clock))
     return index + 1
   }
@@ -247,16 +247,17 @@ export const getItemCleanEnd = (transaction, store, id) => {
 
 /**
  * Replace `item` with `newitem` in store
- * @param {StructStore} store
+ * @param {Transaction} tr
  * @param {GC|Item} struct
  * @param {GC|Item} newStruct
  *
  * @private
  * @function
  */
-export const replaceStruct = (store, struct, newStruct) => {
-  const structs = /** @type {Array<GC|Item>} */ (store.clients.get(struct.id.client))
+export const replaceStruct = (tr, struct, newStruct) => {
+  const structs = /** @type {Array<GC|Item>} */ (tr.doc.store.clients.get(struct.id.client))
   structs[findIndexSS(structs, struct.id.clock)] = newStruct
+  tr._mergeStructs.push(newStruct)
 }
 
 /**
diff --git a/src/utils/Transaction.js b/src/utils/Transaction.js
index eab66829..98caf979 100644
--- a/src/utils/Transaction.js
+++ b/src/utils/Transaction.js
@@ -10,8 +10,7 @@ import {
   generateNewClientId,
   createID,
   cleanupYTextAfterTransaction,
-  IdSet, UpdateEncoderV1, UpdateEncoderV2, GC, StructStore, AbstractType, AbstractStruct, YEvent, Doc,
-  diffIdSet, // eslint-disable-line
+  IdSet, UpdateEncoderV1, UpdateEncoderV2, GC, StructStore, AbstractType, AbstractStruct, YEvent, Doc
   // insertIntoIdSet
 } from '../internals.js'
 
@@ -239,14 +238,14 @@ const tryToMergeWithLefts = (structs, pos) => {
 }
 
 /**
+ * @param {Transaction} tr
  * @param {IdSet} ds
- * @param {StructStore} store
  * @param {function(Item):boolean} gcFilter
  */
-const tryGcDeleteSet = (ds, store, gcFilter) => {
+const tryGcDeleteSet = (tr, ds, gcFilter) => {
   for (const [client, _deleteItems] of ds.clients.entries()) {
     const deleteItems = _deleteItems.getIds()
-    const structs = /** @type {Array<GC|Item>} */ (store.clients.get(client))
+    const structs = /** @type {Array<GC|Item>} */ (tr.doc.store.clients.get(client))
     for (let di = deleteItems.length - 1; di >= 0; di--) {
       const deleteItem = deleteItems[di]
       const endDeleteItemClock = deleteItem.clock + deleteItem.len
@@ -260,7 +259,7 @@ const tryGcDeleteSet = (ds, store, gcFilter) => {
           break
         }
         if (struct instanceof Item && struct.deleted && !struct.keep && gcFilter(struct)) {
-          struct.gc(store, false)
+          struct.gc(tr, false)
         }
       }
     }
@@ -271,7 +270,7 @@ const tryGcDeleteSet = (ds, store, gcFilter) => {
  * @param {IdSet} ds
  * @param {StructStore} store
  */
-const tryMergeDeleteSet = (ds, store) => {
+const tryMerge = (ds, store) => {
   // try to merge deleted / gc'd items
   // merge from right to left for better efficiency and so we don't miss any merge targets
   ds.clients.forEach((_deleteItems, client) => {
@@ -293,13 +292,13 @@ const tryMergeDeleteSet = (ds, store) => {
 }
 
 /**
- * @param {IdSet} ds
- * @param {StructStore} store
+ * @param {Transaction} tr
+ * @param {IdSet} idset
  * @param {function(Item):boolean} gcFilter
  */
-export const tryGc = (ds, store, gcFilter) => {
-  tryGcDeleteSet(ds, store, gcFilter)
-  tryMergeDeleteSet(ds, store)
+export const tryGc = (tr, idset, gcFilter) => {
+  tryGcDeleteSet(tr, idset, gcFilter)
+  tryMerge(idset, tr.doc.store)
 }
 
 /**
@@ -367,9 +366,9 @@ const cleanupTransactions = (transactionCleanups, i) => {
       // Replace deleted items with ItemDeleted / GC.
       // This is where content is actually remove from the Yjs Doc.
       if (doc.gc) {
-        tryGcDeleteSet(ds, store, doc.gcFilter)
+        tryGcDeleteSet(transaction, ds, doc.gcFilter)
       }
-      tryMergeDeleteSet(ds, store)
+      tryMerge(ds, store)
 
       // on all affected store.clients props, try to merge
       transaction.insertSet.clients.forEach((ids, client) => {