Permissions that depend on disabled modules prevent any editing/creation of other permissions

Steps to reproduce

1. make sure that the dblog module is enabled
2. head to admin/people/custom-permissions/list and add a custom permission called "Administer error logs" (or anything you find appropriate), with its route set to dblog.overview
3. save the permission
4. disable/uninstall the dblog module
5. head back to admin/people/custom-permissions/list and try to adit any existing custom permission, or to add a new one, or even try to save the form without making any changes

The above results in an error message, and the form has inline errors in the "Administer error logs" custom permission, saying "The route dblog.overview is invalid."