24w21b will not upgrade attribute_modifiers from previous versions

Upgrading the world to 24w21b causes items' custom attribute_modifiers to disappear

 

This may be that the attribute_modifiers format is different between the new version and the old version

 

Since the old attribute_modifiers do not have an id field, so
You can consider updating Name or uuid to id,
Otherwise, all custom attribute_modifier items will be invalid.