Solo selected group leaving other channels soloed

I have ‘enable solo on selected track’ set on.

If I select between audio and folder tracks, the solo follows the selection as you’d expect.
If I do the same between group tracks, ditto.

Fine, but…

  1. I select and solo my guide vocal, say.
  2. I select a group channel, which auto-solos, but the guide stays soloed!
  3. Clear the solos.
  4. I select and solo a group then select my guide vocal - the group stays soloed!

Only goes wrong when switching between groups and ‘normal’ tracks.
Hope that’s clear.