The issue has been fixed in the latest release of InDesign – InDesign 2021.
Please update to this new version of InDesign to get the fix.
Adobe InDesign teamVladimír Ludvík supported this idea ·
An error occurred while saving the commentVladimír Ludvík commented
Even just opening the keyboard shortcuts menu and clicking OK resolves this issue.
Very annoying to have to do it often.