Xcode 11 beta 6 behind Xcode 11 beta 7 download link?
The release notes for Xcode 11 beta 7 have been updated with:
Warning: Xcode Previews in Xcode 11 beta 7 have a known incompatibility with macOS Catalina beta 6. Upgrade to macOS Catalina beta 7 or later. (54621598) and
Known Issues: Xcode 11 beta 7 incorrectly reports as beta 6 on the welcome screen. (54795525)
My educated guess is that they just forgot to update the name. Note that the About box says the build is 11M392r, which is what the download site says you're getting. By the way, the beta 6 I have is 11M392q.