[$] FUSE folio conversion confusion

Kernel developers have been working to convert various internal interfaces tousefolios; while this process has been progressing, there is still theoccasional regression introduced by the change. In December2024, it wasdiscovered that installing aFlatpak application could trigger a filesystem bug inthe kernel that would cause the software to read incorrect data from the disk.The problem was quickly fixed - only for an another problem caused by the foliorewrite to pop up in the same kernel subsystem. This was discovered by an ArchLinux user, who noticed that selecting files in a Flatpak application wascausing kernel crashes. Now both bugs are fixed, but there may be more bugs to find.