Temporary Editor-lite permissions in Lab-like environments for designing and experimenting.
Mods introducing new content into the game.
Change blueprint behavior.
When building I get the error message "Placeholder is in the way" and it blocks me from building over it, even with super force build.
https://imgur.com/a/3Mridjz
I don't know what those placeholders are, and I've never seen this, so you'll have to provide some reproduction steps.