I apologise for my late reaction but I lost track of this question. I'm using SharePoint Online and experienced this behaviour on two or three occasions.
I don't know if it is already resolved, but I did not find any answer to this moment.
Termstore Value Changes to Unknown in SharePoint List When Using Grid View
Sven Baetens
20
Reputation points
Encountered a strange behavior in two separate SharePoint lists while using a (different) site column containing managed metadata. When adding new items to the list in grid view and entering a value in the managed metadata column, the value unexpectedly changes to an unknown value after completing the entry. This unknown value is not found in any term set.
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Sven Baetens 20 Reputation points
2025-02-28T09:42:28.81+00:00