BUG: Slider render className on wrong element?

As of a recent update I think, the className property is output to a different html on the Slider, resulting in the slider collapsing, while e.g. the RangeSlider renders completely fine.

RangeSlider “col-10” is in the right place

Slider (surrounding div has no “col-10” as it is supposed to)

Or am I missing something? Worked fine before 0.39.0.

switching to 0.39 also throws a couple of other errors, but not always. oO