ever since the august tmodloader update, when i try to fight yharon, and the fight goes for like a minute he just despawns and my player freezes in place, i tried other bosses and they all worked fine
im having a mix of problems, one being what you posted, its a mix of the bosses leaving after a minute [usually when i get hit] and other problems are the bosses turning invis, almost desyncing and freezing my character in place with the only thing i can do is to alt f4
disabled all mods that effect visuals and it seemed to have fixed the freezing issue, still got the weird desync problems and bosses having about 10k+ more HP than they should have