The Bug:
Entities with passengers cannot travel through portals.
Steps to Reproduce:
Build a nether portal, light it, enter it, and return to the overworld.
Summon an entity with a passenger by using the command provided below.
/summon minecraft:spider ~ ~ ~ {Passengers:[{id:"minecraft:skeleton",HandItems:[{id:"minecraft:bow",Count:1b}]}]}
Push the spider jockey into the nether portal that you just previously built, in an attempt to make it change dimensions.
Take note as to whether or not entities with passengers can travel through portals.
Observed Behavior:
Entities with passengers cannot travel through portals.
Expected Behavior:
Entities with passengers would be able to travel through portals.
Related issues
is duplicated by
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I can confirm this. Driving boats or riding pigs through a portal won't work either.
its true
Dinnerbone has confirmed that this is by design, and thus not a bug.
Oh, that's a shame 😞. Does anybody have a link to Dinnerbone's confirmation?

There is no link, just take it what Mustek wrote.
so it will not be fixed? because the status is 'resolved'

Read the comments:
Dinnerbone has confirmed that this is by design, and thus not a bug.
thus
Works as Intended"
Yeah I read that, but the status says 'resolved'.
"Resolved", with a resolution of "Works As Intended".
Ah, ok. Thnks

So has the status on this changed, since Dinnerbone has marked MC-1969 as fixed in 12w50a? This certainly seems contradictory with the claim that the behavior listed here is "by design, and thus not a bug", though I suppose he could have decided to change it anyway.

Status on this ticket is not changed.
Tested with 12w50a: Only unoccupied Minecarts travel through the portal.
Is there any mod that lets this work?
Confirmed with riding a horse.
Just updating this so that people who might report this issue have a possibility of seeing this one.
(the version affected should be updated as well)
this isn't a bug anymore since jeb told this is intended.
Why on earth is this intended? Why shouldn't you be able to ride a horse through a portal?
this is intended because it's to hard to fix and unnecessary
Hi!
I can confirm for release 1.16.3.
A bug that was once fixed makes a return? Odds of that happening?
Can confirm in 20w48a.
Can confirm in 20w51a.
I’d like to request ownership, the original reporter hasn’t been active since April 2019, I will keep this report updated.
Can confirm in 21w05a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 1.16.5. Video attached.

Affects 1.17

A bug that was once fixed makes a return? Odds of that happening?
Happened quite a few times, actually. See https://bugs.mojang.com/browse/MC-67?jql=project%20%3D%20%22Minecraft%3A%20Java%20Edition%22%20AND%20fixVersion%20is%20not%20EMPTY%20AND%20resolution%20!%3D%20Fixed%20ORDER%20BY%20fixVersion%20ASC
Can confirm in 1.17.1.

This may be intentional. See https://youtu.be/EtKcphC4fIc?t=36
The ticket has recently been reopened and recieved Mojang priority, which means the developers classify this as a valid bug.

At this point, might actually treat this as a feature.
Can confirm this behavior in 21w39a. Here are some extra details regarding this problem.
The Bug:
Entities with passengers cannot travel through portals.
Steps to Reproduce:
Build a nether portal, light it, and enter it.
Return to the overworld.
Summon an entity with a passenger, for example, a spider jockey.
/summon minecraft:spider ~ ~ ~ {Passengers:[{id:"minecraft:skeleton",HandItems:[{id:"minecraft:bow",Count:1b}]}]}
Push the spider jockey into the nether portal you previously built and watch it closely.
Observed Behavior:
Entities with passengers cannot travel through portals.
Expected Behavior:
Entities with passengers would be able to travel through portals.
For many years I have to dismount and push horses through the portal, never knew that it's a bug

Affects 1.18.1

Affects 1.18.2

Can confirm in 23w03a

Can confirm in 23w04a

Can confirm in 23w06a
Can confirm in 1.20

Can confirm in 23w32a
So did anyone find a mod for this? Immersive portals doesn't seem to support it: https://github.com/iPortalTeam/ImmersivePortalsMod/issues/681
I've yet to test https://www.spigotmc.org/resources/netherminecarts.110193/ but it's a plugin.

This doesn't appear to be fixed for me?
[media][media]

@unknown Set the gamerule entitiesWithPassengersCanUsePortals to true
The gamerule was removed in 1.21 pre-release 1, but it is now fixed even without the gamerules.