I'm trying to reproduce steps that you have enumerated.
1) create port
2) boot instance with this port
3) while instance is in building state detach port (409 Conflict as expected)
4) After instance become active port attach works well ( not as expected HTTP 500).
I'm trying to reproduce steps that you have enumerated.
1) create port
2) boot instance with this port
3) while instance is in building state detach port (409 Conflict as expected)
4) After instance become active port attach works well ( not as expected HTTP 500).
Enviroment with MOS 9.0