Loading spinners don’t work in quarto + shiny

I’ve been playing around with quarto + shiny. After wasting a lot of time, I have been utterly unable to get any kind of loading spinner to work. I’ve tried both shinycssloaders::withSpinner and various flavors of spinners from the Waiter package. None of them display anything during loading. In contrast, the same code works when in an old-fashioned non-quarto app.R file. Is there some fundamental incompatibility between spinners and quarto?

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