It’s been two years and they still haven’t fixed it.
I was testing this as well and the footage is getting clipped in the highlights and you’re losing latitude in the top part and it adds a lot of noise. The colors are great thought.
Maybe it only works with the default ISO of 320. Because I almost always shoot at ISO 800 I can’t test it. But after selecting ACES and then setting the IDT to Red and the ODT to 709, all my footage seems overexposed, you can pull it back, but not the highlights and it adds significant noise.
Have any of you successfully graded something using RED footage and ACES in Resolve?