Skeletons wearing leather armor still convert to strays in powder snow

I wouldn't expect this to happen, especially because leather armor prevents freezing which should prevent skeletons being converted.

The changelog states: "Skeletons now convert to strays when frozen", and as they are not frozen because of the leather armor, they should not convert into strays

To reproduce:
1. Run

/summon skeleton ~ ~ ~ {ArmorItems:[{},{},{Count:1,id:leather_chestplate},{}]}

2. Observe results

Code analysis

Code analysis by [Mod] ampolive can be found in this comment.