Your bug report

#38597: 26.3; M-x describe-key-briefly does not work with various keys in various modes

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 38597@debbugs.gnu.org.

-- 
38597: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=38597
GNU Bug Tracking System
Contact help-debbugs@gnu.org with problems