Hey, I just experienced another instance of the bug. I just sent you the output of M-x report-
emacs-bug.
Here is the requested information that was in the buffer generated by M-x report-emacs-bug. I experience the same problem on my ubuntu machine.
In GNU Emacs 27.1 (build 1, x86_64-apple-darwin18.7.0, Carbon Version 158 AppKit 1671.6)
of 2020-11-21 built on Traviss-Mac.local
Repository revision: 2003451b61ad44108eedae74fc34b4d7b47d5756
Repository branch: HEAD
Windowing system distributor 'Apple Inc.', version 10.15.7
System Description: Mac OS X 10.15.7