I do get this behaviour, except I don’t get the Disc Cache Load maxed out.
"Group channel has become something else. This ‘something else’ shows nothing in the inspector. Cannot be routed to (as it is no longer listed as a destination) and, possibly most importantly, Disc Cache Load is maxed out - even when not playing. "
Group Channel and FX Channel become “orphaned” when used with a track preset loaded as an insert and the project is saved then reloaded. This happens to me 100% of the time. If I don’t select a track preset, but select inserts “manually” then the group/fx channel is still there and working as normal when the project is loaded.