Here is the danger of this bug on a laptop (as I've experienced):

The system, from all appearances looks powered down (with the exception
of the power indicator which remains lit on my laptop).  Unfortunately,
the power indicator is not in a conspicuous place which means that in
order to *verify* the system is off, I have to lean over and look at the
side of the laptop.

When a user gets into the habit of a system just working, checking the
power indicator slips the mind.  Hence, a powered on laptop may be
placed inside a tightly insulated laptop bag.  When this happened to me,
I didn't discover it for about 2 hours.  When I went to take the laptop
out of the bag, the fan was now running trying to keep the internals
cool, but the bag was insulated (padded).  This resulted in the system
being so hot that I could not even touch the keyboard in places without
getting mildly burned.

I have no idea what will happen to a discharging lithium battery that is
being heated rather than cooled in that situation, but I imagine there
may be a component of definite risk to a system.

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https://bugs.launchpad.net/bugs/1958724

Title:
  System Shutdown and resume hangs since Kernel linux-
  image-5.13.0-23-generic

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