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Debugger crashes when checking liveness: Exception 'util.WrongInvocationException: TLCStateFun.deepCopy'

See original GitHub issue

While using the debugger (model and .cfg file below), I got the following error:

TLC threw an unexpected exception.
This was probably caused by an error in the spec or model.
See the User Output or TLC Console for clues to what happened.
The exception was a util.WrongInvocationException: TLCStateFun.deepCopy: This is a TLC bug.

Happy to provide more details as needed.

model
IBCTokenTransfer.cfg:

CONSTANTS MaxHeight = 2
          MaxPacketSeq = 2
          MaxBalance = 2
          NativeDenominationChainA = "samoleansA"
          NativeDenominationChainB = "samoleansB"

SPECIFICATION Spec

PROPERTY ICS20Prop
INVARIANT ICS20Inv