Mobs in minecarts in the nether do not pass through Nether Portals.
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Thank you for your report!
We're actually already tracking this issue in MC-67, so I resolved and linked this ticket as a duplicate.
However, that ticket has already been resolved. That means that this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
If you haven't already, you might like to make use of the [search feature|https://bugs.mojang.com/issues/
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