Blender Materials Keep Changing

[@diebygaming8015]

Hmm, good point. There is no way to select a material for edits without having a slot, unlike unity for example. The drawback is, you created an extra slot to edit the green material, now you'll have to delete the extra slot at some point

[@StevenWhite-w6p]

You won't. Because Blender deletes any unused slots the next time you save and close Blender.

[@MrBenPi]

The main point is being aware. It is easy to absent-mindedly change materials on part of a mesh and on complex objects that can be very frustrating for anyone when you notice the problem later.