[Bug] KeyNotFoundException exception in garbage collector

[rnd256]

Colyseus Unity3d version: 0.14.8 (latest). It also occurs with version 0.14.7. I haven't tested other versions.
Colyseus server version: 0.14.23 (latest).

Occasionally, after removing a Schema object from a MapSchema, this line throws the error "KeyNotFoundException: The given key was not present in the dictionary":
https://github.com/colyseus/colyseus-unity3d/blob/f80f7f402ad2e51c4ebad59db389c0b4d05ee1ad/Assets/Colyseus/Runtime/Scripts/Serializer/Schema/ColyseusReferenceTracker.cs#L85

If I continue to play my game after this error, I eventually hit a "refId not found" error as well:
https://github.com/colyseus/colyseus-unity3d/blob/f80f7f402ad2e51c4ebad59db389c0b4d05ee1ad/Assets/Colyseus/Runtime/Scripts/Serializer/Schema/Schema.cs#L399

This makes me think that there's some step where a Schema within a MapSchema isn't properly getting added to refCounts and refs in the Unity3d client.

[rnd256]

My temporary workaround is to completely disable the garbage collector by commenting out this line:

https://github.com/colyseus/colyseus-unity3d/blob/f80f7f402ad2e51c4ebad59db389c0b4d05ee1ad/Assets/Colyseus/Runtime/Scripts/Serializer/Schema/Schema.cs#L648

That seems to prevent both of the above errors.

[endel]

It seems this issue has some connection to this one, which has been (hopefully) fixed here: colyseus/colyseus#495 (comment)