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It seems 6.17.xx brings the new yellow color when you first plug the car in. I just noticed it as well when I plugged the car in just now (updated yesterday to the latest update ), haven't seen it when 6.0 came last month.
I'm seeing it too. It looks orange to my eye, but only for a split second.
I've tested it myself and the orange color alerts the user that the cable isn't plugged in properly. If you just push your cable in but not all the way, it'll sit orange until you push it in far enough to get it to latch then start the charging process.
I like it and think it's a good way to let new owners especially know they haven't properly plugged in. Also a good reminder to existing owners from time to time.
I think it's cool Tesla had the foresight to give the port the ability to even generate an orange color. Shows they were thinking ahead.