Skeletons' equipped items on the body and saddle slots are not dropped according to `drop_chances` when converting to strays

Since it was requested that MC-311623 be split up, this report covers equipment transfer when a skeleton converts to a stray.

When such a conversion occurs, the stray retains any body or saddle or item given to the skeleton via commands. Per the standard outlined in MC-311623, it would be expected that the items a stray cannot make use of (body and saddle) would be dropped according to drop_chances (preferably reflecting the chance value exactly), while the remaining items (hands, armor) would be retained by the stray (as currently happens).

This “bug” has basically no impact on the game, so I would not really mind if this were to be designated Works As Intended, Won’t Fix or Invalid. However, should other equipment transfer be fully implemented according to the MC-311623 standard, the reason for the inconsistency may be difficult to describe.

To reproduce

1. Find or set up some powder snow

2. /summon minecraft:skeleton ~ ~ ~ {equipment:{mainhand:{id:bow},head:{id:chainmail_helmet},saddle:{id:saddle}},drop_chances:{mainhand:2f,head:2f,saddle:2f}}

3. Once the skeleton converts, /data get entity @n[type=stray] equipment
   ✅ The bow and helmet have been retained
   ❌ The saddle has been retained

Expected behavior

The saddle would be dropped on the ground since the stray cannot make use of it.