This finally seems to have resolved itself, after taking a little over one month. The issue can be resolved, assuming others are not experiencing it.
The skin is still not available.
This bug may need to be reopened. According to Slime Finder PE, chunks <-28,56>, <-28,57>, <-29,58>, <-30,58>, and <-31,58>. If you will look at
[media], you will see that only <-28,56> seems to be generating slime mobs.
It doesn’t support chrome books
I had that same bug
The despawn is WAI, perhaps. However, this bug highlights the inconsistency in the different sim distances. It does not scale consistently.