It seems that is not supported in POS UI extensions? Can I use some other loading spinner to indicate the page is loading?
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I was about to ask the same question! It would be super helpful if there was a loading state in the new Page component.
So far, we have built our own loading UI, doing the best we can with the current available Polaris Web Components. But we really need a loading state in the page component please 
Loading Spinner is landing soon!
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Hey @Christof_Zirkler ,
Oh I missed this in the release candidate. Thank you so much for sharing
This will be extremely helpful 