The reset FQDN feature currently only affects runtime resources but not workplaces.
When resetting FQDN for a specific <host> the value in FQDN column in BPAResource table is deleted but the line for <host>_debug stays untouched, thus preventing any debug sessions on this workplace.
Please enhance the Reset FQDN feature to remove FQDN values for both: <host> and <host>_debug records.