overleaf/server-ce/hotfix/3.5.12/fix-matching-version-error.patch

--- services/track-changes/app/js/ZipManager.js
+++ services/track-changes/app/js/ZipManager.js
@@ -95,6 +95,19 @@ async function rewindDoc(projectId, docId, zipfile) {
       continue
     }

+    if (previousUpdate && update.v >= previousUpdate.v) {
+      logger.warn(
+        {
+          projectId,
+          docId,
+          previousUpdateVersion: previousUpdate.v,
+          updateVersion: update.v,
+        },
+        'adjusting version for update with matching version'
+      )
+      update.v = previousUpdate.v - 1
+    }
+
     const updatePath = `${id}/updates/${update.v}`

     try {