Slimes not spawning in slime chunks

In my survival world I have noticed that slimes do not spawn in slime chunks at any height (I have confirmed they are slime chunks using the reverse engineered algorithm by protolambda) I have tested this in creative and survival modes across multiple slime chunks and seeds
Note: they seem to spawn just fine in swamp biomes though

I also submited this in the feedback section by accident (sorry about that)

I am using a samsung galaxy tab a