Closing laptop lid while Zoom is running prevents wake-from-suspend when lid opened

[Michael Shiloh]

Hello all,

Lenovo Thinkpad X1 carbon, 8th generation
Ubuntu 20.10, kept up to date and various programs added but I haven't
modified the system.

If I close the laptop lid while Zoom is running, then later on when I
open the lid the laptop does not wake-from-suspend. I've tried
pressing the power button but unless I hold it down for long enough to
force a power off, it has no effect. Closing and re-opening the lid
has no effect.

This only happens if I shut down while Zoom was running. I know that
the work-around is to always close Zoom first, but sometimes I forget.

This only happens with Zoom; in all other cases the laptop wakes from
suspend when I open the lid perfectly reliably.

I don't even know where to start looking.

Any suggestions?