Dear Maintainer,
When putting my computer to sleep with the KDE Plasma GUI, which uses <systemctl suspend> by default on Debian, my computer instead enters a state where it becomes completely responsive and the fans spin up. By turning off the power supply, waiting until the power indicator light turns off, and then starting the computer back up, I can get back to a usable state.
This is likely a hardware-specific bug, though it could also be a hardware flaw (though I do not know how to discern which it is). Since it is hardware-specific, here is a more complete list of my hardware:
Host: B550 UD AC-Y1 (Default string-CF)
CPU: AMD Ryzen 7 5700X (16) @ 4.67 GHz
GPU: AMD Radeon RX 7700 XT [Discrete]
PSU: Gigabyte GP-UD750GM
The GPU is likely not the problem, since I was having the problem with my 6700 XT when I had that.