The bug
1.21 snapshots have finally allowed for entity-riding-entity stacks to use portals. However, this only works if the bottom-most entity in the stack touches the portal - upper members of stacks will not be affected at all.
How to reproduce
Clip a minecart into an obsidian block using MC-8004
Use this obsidian as a bottom block of a nether portal
Light the portal then enter the minecart
Expected results
Since you are intersecting the portal, you would be taken through it. You would either go through it alone leaving the minecart behind, or (preferably) the whole stack would go through.
Actual results
You are not teleported at all.
Linked issues
Attachments
Comments 2
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
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Can confirm, but it could be intentional since you may have to move/move the minecart to teleport once again: