When editing a RAW image (taken with Halide) the RAW adjustment sliders work fine, until you set one at 1.0 (or whatever the max is) and let go of the slider. It then gets stuck at that point and can’t be brought back (ie can’t be re-selected).
This is a particular issue with Boost with defaults to 1.0 and thus can’t be adjusted at all.
It may also depend on where you touch the control. For example, if the control is at the far right edge, it’s easy to place your finger on the right edge of the device (but not actually over the control). If that happens, then the drag won’t be detected.