The thread you reference ends with the post saying "it is fixed in the 7.4.140 controller release", so im not sure how you can say it wasnt acknowledged or fixed.
https://community.ui.com/questions/U6-IW-how-to-trunk-all-5-...
> Tell me about the Trunk VLAN issue with the UW6-IW
The built-in 4-port switch in the U6-IW has significant limitations when it comes to VLAN trunking. etc...
> Did Ubiquiti fix the VLAN TRUNK issue?
Based on my research, No, Ubiquiti has not fixed the fundamental trunk VLAN issue with the U6-IW's switch ports as of early 2025. etc...
Im glad I dont emply you!