github.tarball_from releases

[Dave Allured - NOAA Affiliate]

I am trying to switch from "github.tarball_from tarball" to the recommended
"releases".  The original "tarball" setting works fine, but "releases"
fails to download.  The upstream release and my Portfile lines are:

https://github.com/Unidata/netcdf-c/releases/tag/v4.9.3
github.setup                Unidata netcdf-c 4.9.3 v
github.tarball_from         releases

This makes a download URL which gets "Not Found":
https://github.com/Unidata/netcdf-c/releases/download/v4.9.3/netcdf-c-4.9.3.tar.gz

I tried many permutations of the numbering and prefix strategy, with no
luck.  Is this a bug in the github portgroup, or do I misunderstand how to
specify the version number details with "releases"?  Or something else?
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