Windows 10 Insider Preview 17627.1000 (rs_prerelease) is still latest release- 17631 is not released so guess its from build feet
So far I realize that Chrome also appears in Timeline, before only appeared Edge. Spoiler: Chrome in Timeline
Now that's helpful. I find the control+click from start menu works a lot better than launching through the Edge Sets new tab, as it would only launch Calculator in a new tab. Fun poking around with the various bugs though. Calculator can be launched in a new tab by control+click or navigation keys then control+enter from the start menu, however if you search for Calculator in the start menu and then try to control+click or control+enter it won't open in a new tab. On the other hand, the command prompt can open in a new tab from the start menu or through the search in the start menu.