Spoofed MAC + VLAN priority change (bug report)

[benam]

When I try to change VLAN priority (BE, BK, EE..) on WAN interface with spoofed MAC address my spoofed MAC disappears and I need to reconfigure WAN interface, but there one more problem appears - you can't configure MAC address with active VLAN.
So I have to return to physical link first add a MAC again and then switch back to a VLAN.

Community edition 2.4.5-release-p1