Players get stuck in a black screen / void when entering Nether portals while inside a boat

[lucas-santoro]

Expected behavior

Players shouldnt be able to travel through Nether portals while inside a boat (with or without a villager).

Observed/Actual behavior

When a player enters a Nether portal while riding a boat (sometimes transporting a villager), the screen turns completely black, as if the player is falling endlessly into the void.

After forcefully disconnecting, the player is unable to rejoin the server. The server behaves as if the player is still online, preventing login and effectively soft-locking the player until manual intervention (e.g. player data reset).

Steps/models to reproduce

1. Place a Nether portal.
2. Put a boat in front of or inside the portal.
3. Sit in the boat (optionally with a villager inside).
4. Enter the Nether portal while riding the boat.
5. Observe the black screen / void-like behavior.
6. Disconnect from the server.
7. Attempt to reconnec, login fails because the server thinks the player is still connected.

Plugin and Datapack List

This happens even with a minimal setup.
(No custom datapacks or pluins.)

Folia version

This server is running Folia version 1.21.11-10-ver/1.21.11@1aa7055 (2026-01-04T19:46:20Z) (Implementing API version 1.21.11-R0.1-SNAPSHOT)

Other

This seems related to entity mounting + dimension transfer (boat + player + villager).
Player data appears to get corrupted or stuck in an invalid state (possibly invalid position or region state).
The issue effectively requires deleting player’s playerdata file to allow rejoining.