Riding an entity into portals may cause the game softlock.

Relates to MC-272322.

Steps to reproduce:

1./gamerule entitiesWithPassengersCanUsePortals true

2.Go into the nether.

3./tp 100000 ~ ~

4.Summon and tame a horse and ride it, then build a portal here.

5.Go back from the nether to overworld with it through the portal.

Observed result:

The game will softlock, you will fall into the void (client) but don't take void damage, the server is frozen, and you can't save and quit normally.

Expected result:

You will be teleported to overworld normally.

Notes:

This affects both nether portal and end portal, from overworld to nether/end or back to overworld from nether/end.