(New Studio UI Beta) Play/Stop test buttons only work half the time

I started using the new studio UI today and I’ve noticed that I’m frequently clicking on the play/stop test buttons and having nothing happen. It’s happening about half the time.

Expected behavior

Play should always start a test and stop should always stop it.

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I’ve found that the button is sometimes outright greyed out; requiring me to use the dropdown menu.

We are having trouble reproducing this. Can you share more detailed steps or maybe a screen recording?