So I routinely run Legacy Raids for Gold, Mounts, and Transmog. One of the runs that I do every week on multiple characters is 25H Icecrown Citadel for Invincible. Every time I have done 25H Lich King in the past few years, since at least Legion launch, there has been a bug where I am trapped in combat after the fight has concluded.
LK has died, I have looted LK then taken the portal to the lobby where all the vendors are. After I have sold off all of the gear, I turn around to use the Dalaran portal and am unable due to being in Combat. Now on my Night Elf characters, this is no problem, I just pop Shadowmeld and I am free to use the portal to Dalaran at will. But on any character other than Night Elves, I have to run out of the raid instance in order to drop combat.
While this is not a major game breaking bug, it is a minor annoyance.