Yes, only Safari is available in the Duo simulator. My guess is Apple wants to keep some of UI details with system apps under wraps until the product is launched.

Apparently fixed with 27.2 b3 released today...

Thanks for confirming I'm not the only one. Just curious, what's your report ID? I don't know how Feedback Assistant correlates reports of similar issues, but it still says there are no other similar reports on my side... Let's hope b3 solves this, hopefully tomorrow. This issue is serious enough to have me want to downgrade back to 27.0...