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I think there was an error in the report; the standard desynchronization errors have long been identified. They occur when attacking units with area-of-effect spells (mages, liches) or when besieging a castle with an artillery unit in the garrison. It's clear that these have nothing to do with the version (SOD, Light, TE, WT). It seems that some even rarer case occurred here. In general, don't pay attention to this nonsense, Navukha (captain), as in most situations.
"long identified...studied...but here are new circumstances" :)))
To Medium, there's a save file; check it yourself.
Дипломатия - искусство говорить собаке "хорошая собачка" до тех пор пока не найдешь подходящую палку.