Noise Reduction glitch on G2 ?

Just got the G2 and did a "low light" test for G1 vs G2

I then tried to do some noise reduction in Resolve.

Oddly enough, the "Enhanced" option does not work at all - picture is not changing.

I have to use the "Better" option. But sometimes even that does not work, so I have to choose "Faster" option, which is really bad - I wonder why they even keep it as an option...

Files are RAW 3:1 at 4.6K

Anyone else could try this?

OK just upgraded Davinci to the newest public beta and the NR still does not work properly.

Something odd:
NR works a little bit when I set the ISO to 1600.
NR does not work at all, at ISO 3200.