Insider Preview SDK/WDK for CO_RELEASE

I wonder what happened to SDK/WDK releases for most recent Dev channel builds (Cobalt 213xx). It's exactly four months now without an SDK release if you look at the https://docs.microsoft.com/en-us/windows-insider/flight-hub/ and I recall that SDK tools were supposed to flight alongside respective Windows releases.  So far only Iron 203xx builds were made available from the https://www.microsoft.com/en-us/software-download/windowsinsiderpreviewsdk. 

If you must keep multiple editions in the Dev channel, I would very much prefer the option to select from relevant editions of the Insider Preview SDK/WDK download, just like https://www.microsoft.com/en-us/software-download/windowsinsiderpreviewiso lets you select an edition from all available channels.