OK, that build works on the practical side, AKA the slider bar slides and controls whatever smoothly. The only notable issue is visual.
On shorter sliders, the bar moves smoothly with touch, but the “knob” stays at 0 until the touch is removed.
On longer sliders (EDIT - actually only on my emulator - on the tablet it behaves just like above), the “knob” rapidly alternates from 0 to wherever the slider bar is, then as above, stabilizes where it should upon removal of touch.
Also, slider will not move to new position upon touch, at least not until release (EDIT - I guess that is normal… just never paid that close attention before )