After the fix for MCPE-153524, mobs have stopped spawning in my Ancient City. This Anicent City was loaded in 1.19.0, before the fix for the camp structures not appearing in Ancient Cities. However, I noticed that mobs can still spawn in the surrounding Deep Dark, even though this shouldn't be possible. 

How to replicate (this is how I did it)

-Place a repeating command block down, and add the command "execute at @e[type=(any hostile mob that spawns in caves)] run setblock ~ ~-1 ~wool 3

-Place a chain command block on top of it, and give it the command "/kill @e"

-These two command blocks combined will keep killing the mobs, but also mark the spots where they can spawn with light blue wool.

-Leave it running for abut 10 mins

-When you return, all the spots where mobs spawned should be marked with light blue wool.

Expected result:

None of the spots should be anywhere near any patches of Sculk or Ancient Cities

Actual result:

For my world, there were no spots inside the Ancient City, but there were spots that were on the surrounding Sculk blocks, which shouldn't be possible.

If this helps: I also noticed the Deep Dark music never plays when I'm in my Ancient City