Tiles are copied wrong
There is a plugin that lets you register the objects with negative ID and thus put them in the world
The plugin is: https://poggit.pmmp.io/p/ExtendedBlocks/1.1.1
I don't know if it is possible to allow them with world edit

Test it first, then make an issue.
I've already tried it, that's why I've opened an issue
The right side is a copy paste of the left
When will this be finished?
I say this because now there is a plugin that uses ExtendedBlocks to put 1.16 objects
https://github.com/xSuperr/VanillaBlocks/tree/main/
And whenever you copy an object with negative ID, it automatically turns it into an "Update" block
Block Id -1 is not valid block id value in pocketmine 3.0. It's world formats support only blocks with ids 0-255.
Is there no way to add the negative ID blocks?
World format does not allow it.