ada.a() fails to invoke when loading resources.zip in worlds

And that means? What does this cause?

This is likely a NullPointerException in ClientBuiltinResourcePackProvider#loadServerPack (yarn name) that happens when AbstractFileResourcePack#parseMetadata returns null and loadServerPack tries to call PackResourceMetadata#getDescription (ada.a in 1.17.1 proguard).

parseMetadata can return null when pack.mcmeta is invalid, but it does not throw, which causes it to think the parsing was successful.

Please attach the full crash report and resource pack used