Haha, that is funny. I had three of those happen within a couple of hours of each other. The only way I knew they weren't current was because they didn't show up on my phone just the Tesla screen. I have not seen any of the ghosts appear since I deleted all my texts from the past.
We have a very active family group chat on mostly IOS with a couple of android users... I get the individual messages in the car (including xxx loved a picture notifications) but I never have responded to any of them. I'll try it and follow up.