Here’s some pics of the removed parylene coated magnet. Not as bad as I thought, but still not great. Luckily it all came out in one piece.
You can see some stress cracking, some bubbling, and a whole bunch of surface pitting.
While it hadn’t yet “failed” as dramatically as my first magnet, it definitely left some loose parylene and Nickel floating around in my system. I may have a mild allergic reaction to nickel (it’s pretty common), which could serve as an early warning sign for magnet failures.