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