I had similar problems when I started making UI - the project doesn’t start and is marked as ‘Moderation’. Eventually I found out that I have the problem if texture_blocks are used in the code (any places, even if the code is not executing).
As a temporary solution, try commenting out all parts of the code where texture_blocks are used. The “Moderation” warning will disappear if you re-open UEFN after a successful launch.
If it helps, please vote for the post to get it fixed faster.