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Check your editor for a few seconds. Maybe the last page or reusable element you were working on before this started happening. I’ve had this problem 3 times in the past and the cause was a bug in some modifications that were causing intermittent issues in the issue checker.

So, the issues kept appearing and disappearing, as if I was editing something. This caused this constant update message in the preview. In my case, I had to redo the steps that were showing errors.