Can’t save docx after clearing a mapped field

Hi everyone,

I've got a problem on a project for one of my clients that I can't solve, so I've come to ask for your expertise !

Context

• SharePoint Online document library
• .docx files with Quick Parts mapped to library columns (Choice, Date, etc.)
• Flow uses “Populate a Microsoft Word template”, which only accepts .docx

Issue
When a user clears a mapped field and hits Save, Word blocks the upload :“Correct the invalid or missing required properties.”

Tried (no fit)

• .docm + VBA to delete empty node → works, but Populate rejects .docm
• Blank Choice option → fine for Choice, fails for Date fields

Question
Has anyone found a parameter or a trick that allows when editing a Word with Quick Parts linked to SharePoint Online fields to be cleared without validation errors ?

Thanks !

Charles