I've found 3 module releases with tarballs having 0 bytes.

See Demayl/raku-Email-Valid#10

See also these 2 modules with another tar ball with 0 bytes: https://github.com/Raku/REA/blob/main/archive/A/Audio::Taglib::Simple/Audio::Taglib::Simple:ver%3C0.0.9%3E:auth%3Cgithub:avuserow%3E.tar.gz

https://github.com/Raku/REA/blob/main/archive/A/ake/ake:ver%3C0.1.2%3E:auth%3Cgithub:Raku%3E.tar.gz

Not sure if this is a problem on the user's end or what, but someone should look into it, I think.