Hi,
I was thinking this bug was well known and being adressed.
It is one of the most frustrating one not being able to repair.
I don't have a track but I can add that in my case I try to repair only after one engine is out.
Not sure if there is a link but EACH time I try to repair with one engine out I have the same behaviour as described by shot, meaning the engine out doesn't really stop, you can still hear a light engine noise by the way and there's nothing to do about it.
So the ground crew will refuse the repair asking to shut down engines ...