So here:
https://forum.corona-renderer.com/ CCC eliminates bump, CoronaBumpConverter eliminates CoronaWire bump
(4) is the only one missing? I can imagine it’s because CBC generally converts RGB to bump, even when there is a valid bump information already. And that may be not only expected but intentional. In this case the report over there should go to resolved bugs finally because (7) and (8) seem to be fixed as well (tested with DB v7).
Good Luck