I have to say that bugs should not stay in the game for such a long time, especially functional bugs or bugs that have to do with game mechanics, movement, dungeons, etc.
An example is the boat bug in Dawnbreaker. An entire tier and the bug is still there. It is the least annoying.
I understand leaving other bugs that are less important for a later time but come on. This is affecting timers for M+ and it should have been fixed long ago.