All (annotated) release tags are misnamed. For example, refs/tags/releases/gcc-9.2.0 is really named gcc_9_2_0_release:
$ git cat-file -p releases/gcc-9.2.0 object a0c06cc27d2146b7d86758ffa236516c6143d62c type commit tag gcc_9_2_0_release tagger Jakub Jelinek <ja...@gcc.gnu.org> 1565595539 +0200 Tagging source as tags/gcc_9_2_0_release That breaks git describe: $ git describe releases/gcc-9.2.0 warning: tag 'gcc_9_2_0_release' is really 'releases/gcc-9.2.0' here gcc_9_2_0_release Andreas. -- Andreas Schwab, sch...@linux-m68k.org GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."