I only noticed this once, and haven't/can't reproduce until possibly next round. Filing it anyway/for later. I had 2.2.15 running at home just to observe, wasn't turfing. Restart seem to have been smooth. Yellow zones, same league group, and then later a new group. I clicked the 'tree' button below the new group (4-1).

The tree page was opened with old group, 5-1 highlighted in yellow. Clicking it, or any other group in the tree, opens that group but with no members listed. Restarting the app gives the wanted and expected behaviour: - Current group highlighted - group members populated