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Same thing is happening to me. Did anyone figure this out?

Tried this on two different computers, too. Still nothing. I filed a Feedback fwiw.

i followed @instantinteractive's suggestion but slightly differently: deleted /Library/Developer/PrivateFrameworks installed Xcode.app/Contents/Resources/Packages/XcodeSystemResources.pkg on my system at least, XcodeSystemResources.pkg creates the /Library/Developer/PrivateFrameworks folder. anyway that fixed "Toggle Appearance" in the Simulator for me! thanks for the tip!

i am so tired of having to reboot my vision pro AND my macbook almost DAILY just to get xcode and the AVP to talk to each other again and again and again.

holy carp, juyoungk23's solution (switching to a different network, pairing, then switching back) is the only thing that works for me. thanks for suggesting that. please apple, fix xcode.

if you are using a file that you know should work, it might be the web server not serving up usdz files correctly (with the right mime-type)? is it possible to share the URL to the webpage?

follow-up: i have discovered that just switching to a different network, and then back, works around the issue for me. i don't even have to switch the other device and pair while on the other network. does anyone know if there's a way to do this network "reset" without actually switching between wi-fi networks? turning wi-fi on and off doesn't actually help—only connecting to a different network and back again.