Why are so many distfiles not available for recent pkgsrc changes?

[mlh%goathill.org@localhost (MLH)]

For the past two weeks many distfiles for recent pkgsrc changes
have not been available. ftp.netbsd.org/pub/pkgsrc/distfiles nor
the mirrors that I know of don't have them. For example:
go1.21.8.src.tar.gz, build-1.1.1.tar.gz, pyparsing-3.1.2.tar.gz,
pango-1.52.1.tar.xz and several others. I found build-1.1.1.tar.gz
and pyparsing-3.1.2.tar.gz elsewhere. pyparsing at the git repository,
so why isn't that referenced as a source?