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f33e652
(Get the code!)
Another idea: You seem to be using the default Xorg session so that increases the possible set of components that could tamper with the power state. Please try logging into 'Ubuntu on Wayland' to see if the problem happens there.
And another idea: Check that you don't have 'tlp' installed. It causes random power management bugs. Assuming the issue is not tlp, please also report it upstream at: https:/
If you are feeling adventurous then it might help to figure out the exact time of day the display is waking. Like with a timelapse video next to a clock that's synchronized to the machine's clock. That could then be compared to the system log or might spark other ideas.