4MBL

This bug also affects the outer island end gateways and replaces player placed blocks (shulker boxes and shulker boxes in my case) near them even when there are solid blocks for the player to spawn on.

While I understand that the game needs to ensure that player has an area to spawn, in my opinion it shouldn't generate the platform when spawnable blocks (like netherrack) already exists and in no circumstances replace player placed blocks like shulker boxes that may contain invaluable items.

In my case the platform generation seems to only happen when joining in to the world. In my opinion it would make sense for the platform to also generate when traveling from the main island end gateways (if a spawnable area does not exist), similar to how the obsidian platform on the main island regenerates when entering an end portal on the overworld.

This bug happened on my realm on version 1.21.21 if that helps.

Version 1.19.10 added ability to locate biomes, POIs are still not possible to locate with the command.