Joining world outside of spawn chunks whilst riding entity results in desync

1.  Teleport outside of spawn, e.g. /tp 9999 128 9999
2. Spawn horse using horse spawn egg
3. Feed horse lots of sugar
4. Ride horse until friendly
5. Put saddle on horse
6. Log out
7. Log back in
8. You do not appear to be riding the horse, the horse is invisible.
9. Change gamemode using command. The horse becomes visible and you start riding it.

 

Does not exist in 1.13.2. Does exist in 19w03c.