If you enable entitiesWithPassengersCanUsePortals (true) you could get teleported into the void if you are in a boat. It happened with pigs, foxes and bees. Check video and photos.

Steps to Reproduce (watch video)

1. Place a boat and a pig in it.
2. Get in the boat.
3. Go into Nether portal.
4. Tped into the void.

Expected Result
It would teleport you into a solid base in the Nether.

Side Note

It did not happened every time tested. Using java 24w21b version and experimental features.