Majuro is easier - you have my later Marshall islands package installed.
I put the US airstrip at Majuro, but for earlier than 1944, it really shouldn't have anything other than a rough emergency strip.
I'm guessing a layer hierarchy issue is wiping my strip out as it tries to load Masriders strip?
I have the following active:
My Carolines package
My Marshalls package
My Palau package
My backdating of MRs Marianas
Maskriders 2019 Gilbert's package
and what little is left of Maskriders Micronesia package.
This is Majuro...
& I see this over Fanning Atoll...
Looks like you're missing some files from MRs Micronesia package, it's too far out in the Pacific Ocean for it to be conflict with other packages.
If it helps, I've attached a list of the files remaining active in my MR_Micronesia scenery folder - a lot has been superceded/ replaced by later stuff.