Horse despawned despite being nametagged with saddle and attached to a fencepost

Logged on today to my friend's realm find my horse had despawned despite being attached to a fencepost and nametagged. This is extremely frustrating as I had spent forever breeding a perfect horse only for it to dissappear

This seems to be an issue that has been around for a long time and really needs fixing

Would have a pic but there is nothing to have a pic of. The only thing that was left behind was the lead attached to the fence and no horse to be found