I am posting here since I can't in the jira section.
For me the whole thing happens while on a boat crossing regions mostly. Today I tried the sky-off option and first thought it got better indeed, but at the end the failed TPs happened again, and then three times after each other on the next crossing after logging back online. That means, I can't say that there is a big difference between sky rendered or not. Sorry.
But of course I will continue to read the comments in the jira and try to help testing where it makes sense. I very much hope that this issue's reason will be found soon. It is so frustrating not being able to finish races for about two weeks now.