There are some bugs with the planetary summary in the current prerelease (and other recent ones), which we hope to have fixed soon.
Thanks for letting us know; I had made some fairly aggressive changes to the summary code since it was allocating a surprising amount of memory due to some non-intuitive side effects of basic .NET data structures. The tradeoff is that what used to work just fine now has a number of oddities that weren't really predictable, but y'all are finding them, and now I can fix them.