These should have at least a tooltip indicating that they cannot be destroyed after placing.
Or if possible prevent them from being placed by players at all.
You can only get them in creative mode, cant you destroy them in creative mode?
They have no hitbox for interaction with them, they are basically just an invisible collision box for entities. So no chance to destroy them.
I could override canPlaceBlockAt(), but as usual the forge documentation is nonexistent.
So I have not clue if this just prevents the player from placing them or placement in general, like are they still be placable as borders for the spatial dimension?