Hi @dave0688 - thanks for raising this. I just removed the samesite=none option, so that we avoid causing a server error.
https://github.com/discourse/discourse/commit/cb8f8de422b8b270dc57f3614d3d9d718bfc40ef
We have the rack upgrade on our radar, but it will be quite complicated. I don’t have an exact ETA.
Once it’s upgraded, we’ll be happy to add the SameSite=none site setting back again.