Sorry for the new thread but the old one was closed.
Since we had the same problem as in this thread (https://umod.org/community/true-pve/41340-mrls-and-pve), we installed the version posted there. Now we noticed that NPCs can destroy the MLRS. Can this have a connection? Because I think this problem started since this fix, but I'm not sure.

I have also tried to insert the line, but unfortunately that did not solve the problem.
"nothing can hurt mlrs",

Thank you so much

download from https://pastebin.com/shZvWQya again and let me know if this solves the issue for you

You are my hero! The MLRS no longer disappears! You can't believe how long I've been working on this problem!

Now another problem that we just noticed today and may have the same source of error:

The Sam Sites in the Raidable Bases are not attacking the players anymore. The SAM Sites at the Launch Site work as they should, also the ones placed by players outside work as they should, only the ones at the Raidable Bases don't work anymore, they don't react at all.
I added the PlayerSamSitesIgnorePlayers tag you specified in the fix from the link, but maybe that's not compatible with the Raidable Bases yet?

that is fixed in the next Raidable Bases update

Really?? Oh wow! All headaches are gone. Thank you so much!