HDR colour correction and Export

Huh? What specific number-dot-number version are you on, like 26.3.0 buildX …?

How are you setting up your color management ? You are setting up color management, right?

You have choices for Rec.709/SDR, and HDR in either HLG or PQ, whether to use a wide gamut sequence working space or not, the monitor/export space for the sequence, and the choice to skip all color management and go direct from “raw” clip data to export. That pretty much covers things.

The inverse transform option needs a better fix granted, but they are working on that.