Damn, i forgor. Sorry, CI runners.
Apparently, the _whole_ filename was checked with GetValidArchiveContentFilename, not just the stem.
What the regex does is it matches everything except alphanumeric and [_()[] -], excluding EOL since regex101 seems to also match it, and we probably don't want that to happen.
MatchesOnlineID
IScoreInfo
BeatmapSet.Metadata
StoragePath
APIUser
ModelExtensions
GetDisplayString
GetDisplayString()