Xcode 12.4 not showing old simulators

Under preferences :: components there is usually a long list of simulators that you can install. I am not seeing any of them (empty). Is there a trick to downloading old simulators?

I am trying to track down a regression between iOS 14.3 and iOS 14.4.
I'm having same issue. Hope someone can help.
Just checked, mine isn't showing any either. :(
Xcode 12.4 not showing old simulators
 
 
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