Player sitting on a Cushion does not teleport when touching an End Portal

Steps to Reproduce:

1. Build an End Portal frame (or use one in Creative mode).

2. Place a Cushion block in the center of the 3x3 portal area (where the portal blocks are supposed to generate).

3. Activate the End Portal using Eyes of Ender.

4. Right-click the Cushion to sit on it.

5. Observe: The player remains seated inside the active End Portal block without being teleported to the End dimension.

Observed Behavior:
The player sits inside the End Portal block, but the teleportation logic does not trigger. The player remains in the Overworld, stuck as a passenger on the Cushion.

Expected Behavior:
The player should be teleported to the End dimension and automatically dismounted from the Cushion, matching the behavior of a player walking into the portal.