This is probably with all mobs (maybe even with players), but you can see it best with entities you can ride:
Summon a rideable entity (but not a horse)
/summon pig ~ ~ ~ {Passengers:[{id:"cow"}]}Teleport rider (here Cow away)
/tp @e[type=cow,distance=..4] ~ ~-1000 ~1000The cow is still somehow riding the pig even though it is in the void:
Pos:[0:-863.029259801175d,1:-943.3250000178814d,2:1488.0782719644458d]}You can still give the pig a saddle (rightclick) but when you then try to ride on it, it doesn't work
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Is this still an issue in the current Minecraft Snapshot 15w45b or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Confirmed for 1.15.1.
After teleporting the cow to the void, it dies and no longer exists. But the entity does still exist inside the Passengers array of the pig. If you then kill the pig, the cow will suddenly come back in the position where the pig died.
By the way, teleporting an entity within a close proximity of the mounted object will dismount the entity
Based on the resolution of MC-275505 this seems to have been fixed
MC-275505 was changed to Fixed, does that mean this is Working as Intended?
Edit: Nevermind, the /rotate command changes that issue.
Affects 15w42a