This statement doesn’t make sense to me. I’m not trying to be purposely obtuse!
Do you mean that the reference client is older code that predates the Legion client that is WoW Classic?
If that’s the common speak, then sure. I wasn’t aware of this. Client may have a different meaning to me, as I have a background in software engineering.
I’m completely unfamiliar with the thrash bug, but curious about it.
Is this something you remember from Vanilla, or from private servers? Is there some BC video proof? I’m curious here how we would know definitively that this obviously incorrect gameplay.