I didn’t need the guest network on the 5GHz wifi so I deleted it. I then noticed that my “normal” 5GHz network was not visible on any client.
As a workaround, I recreated a dummy 5GHz network that I disabled and this make my “normal” 5GHz network visible again.
2.4GHz are not affected by the presence of the extra 5GHz network.
TurrisOS 5.3.0 5e8b9624f1791d193e8d5e007ce4c873454f014a / LuCI branch git-21.301.66621-6335d0f