In 1.16 snapshots the Diamond sword was changed to use more colors from the old Programmers Art texture pack to look better, and the same color was even given to the edge of other diamond tools and armor to also look better. Despite this happening to diamond equipment it has not happened to other tools like stone, iron, wood, and gold, which makes for an inconsistency between all the tools. The image below shows which tools were given the same and correct colors (The ones with check marks) and the ones with different and wrong colors that are yet to be changed, (The ones with Xs) which all lead up to a combination of the colors to show how it's different and not the same like it's supposed to be. Note that the picture shows certain tools but it effects all armor and other tools that are its same material with the same colorings.