This morning, my Recently Opened folders are missing in Insiders. Not sure whether this happened right after updating, or earlier, or what the order of events was because I was looking at a different issue.

"Open Recent" shows this list

The top two I opened manually, the others I guess have unsaved changes.

I don't think other global data has been lost. It seems like the window size and position was restored and I'm not getting notifications that I clicked "don't show again" on.