Test another update.

backend/src/Squidex.Data.MongoDb/Infrastructure/MongoExtensions.cs

@@ -168,11 +168,6 @@ public static class MongoExtensions
         var (key, snapshot, _, oldVersion) = job;
         try
         {
-            Expression<Func<T, bool>> filter2 =
-                oldVersion > EtagVersion.Any ?
-                x => x.DocumentId.Equals(key) && x.Version == oldVersion :
-                x => x.DocumentId.Equals(key);
-
             var filter = filters.Eq(x => x.DocumentId, key);
 
             if (oldVersion > EtagVersion.Any)
@@ -182,6 +177,20 @@ public static class MongoExtensions
 
             var result = await collection.ReplaceOneAsync(filter, job.Value, UpsertReplace, ct);
 
+            if (result.IsAcknowledged && result.ModifiedCount == 0 && oldVersion > EtagVersion.Any)
+            {
+                var existingVersion =
+                    await collection.Find(filters.Eq("_id", key))
+                        .Project<BsonDocument>(Builders<T>.Projection.Include("_id").Include(versionField))
+                        .FirstOrDefaultAsync(ct);
+
+                var currentVersion = existingVersion != null
+                    ? existingVersion[Field.Of<T>(x => nameof(x.Version))].AsInt64
+                    : EtagVersion.Any;
+
+                throw new InconsistentStateException(currentVersion, oldVersion);
+            }
+
             return result.IsAcknowledged && result.ModifiedCount == 1;
         }
         catch (MongoWriteException ex) when (ex.WriteError?.Category == ServerErrorCategory.DuplicateKey)

backend/tests/Squidex.Data.Tests/Shared/SnapshotStoreTests_T.cs

@@ -104,7 +104,8 @@ public abstract class SnapshotStoreTests<TEntity>
 
         await sut.WriteAsync(new SnapshotWriteJob<TEntity>(sourceKey, sourceValue, 42));
 
-        var ex = await Assert.ThrowsAsync<InconsistentStateException>(() => sut.WriteAsync(new SnapshotWriteJob<TEntity>(sourceKey, sourceValue, 2, 1)));
+        var ex = await Assert.ThrowsAsync<InconsistentStateException>(() =>
+            sut.WriteAsync(new SnapshotWriteJob<TEntity>(sourceKey, sourceValue, 2, 1)));
 
         Assert.Equal(42, ex.VersionCurrent);
     }