I can confirm. I have 2 ET12's and 2 ET8's, respectively updated to 24610 and 25124. I get 6GHz connections on the main router (ET12) and ET12 mesh node. Both the ET8's only allow 5GHz connections. Very disappointing.
I have a similar mesh network, except 2 ET12's and 2 ET8's, with one of the ET12's as the primary router. All nodes are connected with 2.5G wired ethernet backhaul. I can get a 6GHz connection on the primary router AND on the ET12 node, but NOT eit...
