This will be covered. Not really any console commands that I’m aware of to tweak, but there commands to troubleshoot and change to the alternative method using HZB Occlusion that I plan to cover.
Not sure how this is setup that may be causing the issue. Possibly updating the ambient cubemap at runtime? If so, that could be a reason, but I’ve not invested the time to look and see what’s going on there. If you have a specific setup that reproduces this and want to post on the AnswerHub, then post the link here I can have a look when I get the time to see what may be going on. But more than likely, if you’re updating the skylight capture at runtime this may be the reason why.
Also, not sure on the Dynamic Material Instance, but that sounds like a buggy kind of thing. You may want to post that in the AnswerHub Bug Reports section and we can confirm if that’s the case or not. But it does sound like that should be happening.