This has been an issue with a couple modpacks I like but I've always been able to brush it off, no big deal. But recently I went back to "Permafrost" which is one of me and my friends all time favorite modpacks, and one we've played on aternos before. However it was missing from the searchlist, so I google "aternos missing permafrost" and find a forum post from Nov 1st 2021 that talked about how it was removed due to outdated server files but now the server files were updated and so it was re added. This made me realize it was probably the server files so I checked and they're in date, so I go back to the mod list and I go to suggest and it its declined due to outdated server files. Gonna be honest really annoyed with this especially because I hyped this up to a couple of my friends who hadn't played this pack yet and me and the other friends who had played it were already excited.
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