Hmm...
I know Fall Guys had an issue where Proton didn't properly integrate shared resources, and thus, they weren't able to implement support until fairly recently. It could be a Proton bug. Regardless, I'm grateful that you guys have looked into it.
I've read that it's been a common problem where the library file is mistakenly placed in a directory where EAC doesn't look for it. Might be worth double checking, just to ensure that this isn't the case.
And the setting doesn't exist on the partner site? I'm surprised that I haven't heard of this issue before. This was checked after the update late in January? If so that really sucks, and I wonder how that might get resolved.