Custom tag Property within UDT tag not getting deleted

I have deleted the custom tag property which i created in a memory tag of a UDT. (pleas see image 1)

but the custom tag property still exists in the UDT instances (please see image 2) . I am writing values to this custom property earlier ut i stopped those scripts as well. but still it is not getting deleted.

Had anyone faced similar issue ? Please let me know the solution.

This is expected behavior since there is an override on the UDT Instance. The override essentially removes the property from being updated by the UDT definition.