Curves YSFX (invert) sliders do not invert completely, 15b2

I've tried this on Mac/Windows, v15 beta 2.
When inverting RGB 0,0,0 I expect it to become 1023, 1023, 1023 and vice versa. The black values do indeed end up at 1023, but the white values stop at about 64.

Data Levels in the project are set to Video (setting to Full doesn't change this behavior). Also, I expected the middle point where the two meet to be 512 (or 511) but it's above that.
Inverting with a LUT works as expected.
When inverting RGB 0,0,0 I expect it to become 1023, 1023, 1023 and vice versa. The black values do indeed end up at 1023, but the white values stop at about 64.
Data Levels in the project are set to Video (setting to Full doesn't change this behavior). Also, I expected the middle point where the two meet to be 512 (or 511) but it's above that.
Inverting with a LUT works as expected.