After converting my world I went on horseback and explored out to the new infinite world size. Once I got close to the old barrier world size my game crashed. So I loaded back up the world when I loaded my horse was gone. I explored out to the newly generated chunks, everything generated alright and correctly. So I go back to my base/spawn mad that my fast horse disappeared when all of a sudden I instantly mounted my same horse back. (I have a clip of this)
So recently I walked on foot out kinda far, leaving my horse back home with no armor. And then all of a sudden the horse was instantly mounted by me 20 blocks away, with armorwhen I left him very far away without armor. Thinking my horse duplicated I went back to my house with the armored version thinking the real version would be there without armor. When I got back he wasn't there and I was just left with one horse and duplicated armor. (I left the old armor in the chest)

Please fix this it is a nuicance to crash and randomly have my horse appear everywhere. It seem as if there is saved version of the horse when the game crashed and when I got out to a certain area i teleport on the saddle.

Video:
https://1drv.ms/v/s!AvjuhqNgHL2jiQLWhF2GUkguLYln

(This is a converted world that failed to convert until the 1.2.5 update)