I believe this is caused by workers removing the log from the fire which is where it happened in the previous version of this bug. example have 2 hearths. worker will go light fire pick up burning log which will then go out fire continues to burn in hearth proceed to next hearth and use the same log to light fire then remove log and go build a wall or something with the log or place it back in the stock pile. they almost always pick up the log again after lighting the fire and do something with it. on the few occasions they haven’t picked the log back up i do not see this error.
edit attaching dxdiagDxDiag.txt (61.7 KB)