Actually, probably a feature. It appears as if it's detecting that your mesh node can't support those channels so is keeping you from selecting them and getting yourself in trouble.@john9527 and @ColinTaylor
I figured it out!
After adding my AC86U as node the channels 120 124 128 disapeared on the new router where I could see these channels before. I removed the AC86U from the mesh and the channels are available again .... Is this a bug?
I don't think AX86U has site survey on stock firmware, but someone correct me if I'm wrong.Old topic but a nice FYI. when DFS keeps being busy for hours (>6) run the site survey, within 1m you get the Idle state.
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