Unable to add a custom field to a new or existing entry

[aung-st]

OS: Fedora 41
DE: Gnome

When I create a new entry and add a custom field to that same entry then the save button is disabled and I cannot create the entry until I delete the custom field. The same applies when I try to edit the entry.

Without custom field

With custom field (empty)

With custom field (filled)

Thanks in advance!