#211867 Scroll bar to choose material vanishing

I'm encountering the same problem, plus in the other selection (tiles/pipes) there is too many materials to fit within the box, it's uncomfortable to move the slider and even with that I can't move it in the whole range - I can hardly see the edge of the abyssalite icon when moved to the limit. I guess the window may be remembering the shift made in the other selection, thus it shifts copper behind the left edge.

I have seen the same bug. Fortunately, it looks like you can click and drag anywhere in that materials selection box to scroll your options -- you don't have to use the slider bar.