Board Game Arena

I pushed a new version of my game (Hand and Foot) this evening. It apparently broke arena game creation, so I reversed the deployment.

I suspect it had something to do with some changes I made to the game options, but I have a more general question than "what did I do wrong this time": what things do I need to watch out for with respect to arena settings and game updates. I.e. what kind of changes to a game are likely to cause problems with arena settings?
Also:
* What is stored in an arena season settings? (a concrete example would be useful)
* Is there a way to test in studio against current production arena settings? (e.g. create an express game in arena mode)
* Can arena settings be updated in some specific way mid-season at the developer's request?

Is there any documentation in the doc wiki or elsewhere on this? (Hint: searching wiki on "arena" isn't useful for obvious reasons.)

I don't play arena games or have anything to do with arena season management. I suspect I will have to hold this release until the current H&F arena season ends, and/or rethink some of my option changes.