Did they fix undercity layering bug?

Hi folks,

I last played back in January or something like that and wanted to quest 100% through every expansion on Chromie Time, but I got really annoyed and quit when I hit a pretty major bug that stopped me from progressing my character the way I wanted to play, as the Undercity was constantly breaking. Was running up to it; it was showing it as a normal Undercity, then it would flip to the destroyed version, and the gas would start killing me. (I couldn't use that NPC that allowed you to fix the timezone issue because I would have had to complete certain BfA quests, and that would make me jump to a different timezone, which would make me really confused as to what I'm doing, as I'm relatively new to WoW, hence me wanting to experience it all in order)

So I was never able to actually progress. I read the forums after this happened and saw it's been a bug for a while, so I wanted to check up and find out if this bug has been fixed because I kinda want to retry this, but theres no point if that bug isn't fixed. Because it will deny me from playing the way that I want without leaping around time zones and doing a few quests here and there to unlock the NPC.