For what it's worth, I had a similar failure to my right tail light just last month which was replaced under warranty.
On my invoice, the following parts were fixed/replaced:
-Replace right bulb support and retrofit ground cable
-Repair cable tail lights
-Bulb socket, right
-Description: Replace right bulb support and retrofit ground cable (main work) as per SIB 630517 due to burnt connector
I even experienced the same thing as you where the tail-light worked briefly after the initial error messages, before failing again, so the issue was not the bulb. I even had the one dim bulb and the fast turn signal thing. Also it's a 2016 228i so essentially the same car as you.
I highly doubt the body work had anything to do with it, and sounds like an excuse to deny a warranty claim. I would suggest you go to the dealership and ask to speak to the GM and mention the SIB code above or try a different dealer.
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