Beginning and end transition colors: This is intentional. I'm having trouble finding the conversation, but it boils down to is that each color thumb is the start of a new color. Before a thumb, it is either the previous color or empty/gray. After a thumb, that color goes to infinity or until the next thumb.

Yep. This was a valid request from Maps. They have situations where the color doesn't start until a certain point. The best way to illustrate that was to use gray since that felt "disabled"

Originally posted by @snide in #2850 (comment)