The infinite rotation of the reset icon on hover perhaps looks a little too much like a loading spinner and it might make you think some action is being processed. A one-time 180 degree rotation counter clockwise may be better? Currently it spins clockwise.
The icon is very small and partially obstructed by the cursor when hovered so it may not initially be super clear what’s going to happen when clicked.
I’ve already mistakenly clicked the undo button several times when I intended to click the control label. Don’t know what’s to be done about that though. But I have a feeling there’s going to be lots of unintended undo’s.
The indicator sometimes sits closer to the edge of a container than the control label, so it looks detached from the label. I think only within a .tco-value-list
The blue color is generally used as the highlight / active color and on controls that have breakpoint values set. Do you think that for this different type of ‘is modified’ state a different color may be better? Yellow perhaps?