Thank you for reporting the issue to us.
We have fixed the issue in the latest version of InDesign, Id 14.0.3
Please upgrade your InDesign application to the latest version to try out the fix.
If you are unable to see the update yet, go to Creative Cloud desktop application, open the menu (three dots) from the top-right corner and click on ‘Check For App Updates’.
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You may also follow the below given link for the list of all fixed issues in Id 14.0.3
An error occurred while saving the commentAli Çınkı commented
Same here... GREP doesn't work in my ME version. I will downgrade until it will fixed.