Does the Xcode 12 GM seed not include macOS 11 SDK?

Installed the Xcode 12 GM on a couple systems, updating from Beta 6, only to discover that it doesn't include macOS 11 SDK. No indication of this particular change in the release notes. Am I missing something obvious? I would imagine that to be the default SDK, if anything... but instead it defaults to the 10.15 SDK? 🤔

Thanks!
From the page for beta/applications the 12 GM blurb says this about that:

"For development on macOS Big Sur or to support Apple silicon, continue to use Xcode 12 beta 6."
This works on the Xcode beta on Catalina (NSTableView API addition)

Code Block
if (@available(macOS 11.0, *)) {
self.style = NSTableViewStyleFullWidth;
}

But doesn't work on the Xcode GM with Catalina.

It's not specific to Apple Silicon. Oddly, it does compile with the GM Xcode on Big Sur.
For development on macOS Big Sur or to support Apple silicon, continue to use Xcode 12 beta 6.
Does the Xcode 12 GM seed not include macOS 11 SDK?
 
 
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