iPad in guided access mode - screen keeps being woken up

I’m trying to use companion app on mini iPad with iOS 15 in guided access mode. The problem is, the screen gets woken up periodically even if tablet is not being used and turned screen down. Screen is not put back to sleep and this is draining battery very quickly. Is this an intended behaviour of the app?

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Having exact same issue since last few updates … weird. My iPad will not dim or sleep when using app.