CRPL error (Doesn't seem dangerous)

[Builder17]

I got this error while playtesting combination of CWDig and PAC modes, only visual bugs so far.

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InvalidOperationException: Collection was modified; enumeration operation may not execute.   at System.Collections.Generic.List`1+Enumerator[CrplCore].VerifyState () [0x00000] in <filename unknown>:0     at System.Collections.Generic.List`1+Enumerator[CrplCore].MoveNext () [0x00000] in <filename unknown>:0     at CRPLTowerManager.PausedGameUpdate () [0x00000] in <filename unknown>:0     at GameSpace.Update () [0x00000] in <filename unknown>:0    (Filename:  Line: -1)

Save file attached in case somebody wants try to replicate bug.