Map levels wont show up in content browser

Honestly I don’t know if it was converting to 4.20 or not when i happened but my map levels are not showing up inside the content browser even though they are in the directory on my hard drive . I’ve converted this project thru 5 different engine versions and this is the first where it seems to be losing many maps . There is no crazy blueprint stuff going on or code - almost exclusively models and marketplace stuff which does have some blueprinting but mostly particles and effects -
how do u load a map thats not showing up ? I have an older version in 19 so I can see many maps are missing - why does it do this ?