The fix for this issue is now available in the latest update of InDesign – that is, InDesign 15.0.2.
Please update your InDesign application to get this fix.
Adobe InDesign team
An error occurred while saving the commentTerence McGinnis commented
I am using InDesign 15.0.2 and Command Z Undo still does not work. Irritating as ****. What's next? No cut and paste? Not acceptable at all.