I found a slime chunk right inside my straight mine so I dug out a 16x16x3 chunk at level 19 and coordinates 71 19 -120. I have lit up the room light levels are above 10 everywhere and there are no other mobs spawning inside.
I have been waiting for about an hour afk with the game active at around 32 blocks away (coordinates are 90 11 -125) in order to get some slimes to spawn but still not even one.
Confirmed slime chunk with - http://chunkbase.com/apps/slime-finder#-1729309068124591226
The height level is below 40
Several nights have passed
Player position is around 32 blocks away from the center of the slime chunk (coordinates of center 7 19 7)
- Playing on 1.12.1 without any mods
- There isn't a huge stack of monsters around the slime chunk (there is a ravine right above it but its lit up)
- I searched for questions like this but they were mostly either related to a different problem that I have already solved or from 2+ years ago.
What could be causing this issue?