Whats the deal with riding a wild horse and moving trough doors ?
This seems generally something the critter refuses to like to do.
(seems it needs a bit of awkward persuading to get it to go trough doors)
(Don't know if tame version has the same objections with doors. As I don't have one of those in stock)
(Same deal with other means of fast transportation. ... ie: unchecked.)
Ender and current official latest / newest / default client.