Community Owner was able to change its role
If you are an owner it should be impossible to set a different role if the account role is owner:
https://gitlab.syncad.com/hive/hivemind/-/blob/develop/hive/indexer/community.py?ref_type=heads#L582
Yet this community managed to do it: https://peakd.com/c/hive-161465/about
with this tx:
https://hiveblocks.com/tx/015cd5ce5c9013d428d1382a75812b243b866408