Sometimes end gateways don't teleport the player back to the main end island.

The bug is particularly present when you place blocks above the end gateway because when an entity intersects the end gateway block, it gets teleported to the block above the end gateway and not to the main end island or vice-versa.

The blocks above have to be a bit to the side, if they are directly above the end gateway block, the bug usually doesn't happen.

Also, if the blocks above are either bedrock or end stone, the bug happens in a different way: entities also get teleported to the same end gateway where they went in, but some times (in certain block configurations) they don't spawn on the blocks above but below the gateway (as usual).

If the blocks above the end gateway are either chorus plant, fences, walls or fence gates, when the player or other mobs teleport to the same gateway where they went in, they fall through that respective blocks placed above.

Please fix the end gateway mechanics...

Tank you very much for reading about this bug !
Also, kudos for making the End<=>Nether transportation reliable !