Horse Armor is not showing properly on the horses.  As of this week's update, horses that already had armor still appear to have the armor on if it's removed (pictures 1 & 2).  Likewise - horses not currently wearing armor will not appear as wearing armor once it's placed in the slot (pictures 3 & 4).

[Note: I checked to see if this issue was submitted already - all instances that I've found are several years old and marked as "Resolved".  I have no idea what the original ticket may have been in all of those, so I'm starting this new one]