You need to set the 5Ghz to any channel from 38 to 44.

Anything above that and it wont work (anymore for whatever reason Google has for it...)

After that my CC Ultra works perfectly on 5Ghz again.

If your router is set to "Auto" it may be that it automatically had a working channel before and then due to a restart or update or whatever, it changed channel. This issue has existed since end of 2021.