A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Similar problems with a file I use to track personal savings accounts on a monthly basis going back to 2007 on Office 2016. All comments made before October 2018 now malfunction; some just show indicator and no comment, others show the comment but the box is just a few pixels high although they can be expanded. Interestingly if I go back to previous versions of the file saved before October 2018 in file history, all works fine, so if all else fails I can set up some sort of "archive" file for when I need to check pre-October 2018 comments - a nuisance but a solution of sorts.