I was not recording, so I don't have a video to attach, but I was attacking an Ahsoka team in TW with Leia (Leia/Drogan/R2/Raddus/jyn vs Ahsoka/Ezra/Hera/Huyang/Fulcrum), and my Raddus got targeted first. I was able to revive him with Jyn's special, and she was not able to be defeated at this point. Later, though, Raddus was defeated shortly before Jyn and I was able to revive both using the ultimate from Leia. Jyn would then be defeated with Raddus at full health.
I assume it's some sort of interaction with them both being revived at the same time, as the unique on Raddus does not mention a limit, just that Jyn can't be defeated while he is active. If it helps for debugging this, I had Raddus placed before Jyn in the team order.
