Since last Update (946):
UdonSync now fails to accept UInt64 on client-side when network packets are received, claiming it is unsupported, while it is officially supported and worked before:
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[FlatBufferNetworkSerializer] Caught ArgumentException while encoding UdonSync: Unsupported type UInt64
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Our synced variable is declared like this:
[HideInInspector, UdonSynced(UdonSyncMode.None)]
public ulong _syncData1 = 0;