I had dyed armor on a stand and it turned white with 1.12.0 I thought it was a numbers change and I needed to change out the armor. NOPE! No matter what leather armor I put on, even if it isn’t dyed, it is white on the stand. When I remove it in my inventory and on my player it is the color I dyed it. I can’t include a screenshot because I’m on Xbox.
We are still having this same issue on Windows 10. Leather armor (plain or colored) is white on armor stands.