The fix for this issue is now available in the latest update of InDesign – that is, InDesign 15.0.3.
Please update your InDesign application to get the fix.
Adobe InDesign team
An error occurred while saving the commentAnonymous commented
December 10, a freshly installed version of 16.0.1, still happening. Changing to Hunspell works, but no long have the option to search just Selection or Story.