In the version 3.5.4: when edit a partial it checks for a uniqueness of name/format/handler combination in all partials in the system including deleted, so if there is a deleted partial with the same name the system will not allow you to update a partial.
In the version 3.5.4: when edit a partial it checks for a uniqueness of name/format/handler combination in all partials in the system including deleted, so if there is a deleted partial with the same name the system will not allow you to update a partial.