

Don’t have a Framework, but I think it’s due to the whole ‘modern standby’ approach where the firmware doesn’t implement ‘standby’ anymore and just let’s the OS put everything into as low power state as possible, component by component.
It doesn’t work well for Windows either, which is why a Windows laptop I have will ‘standby’ for maybe 15 minutes before shutting itself down for ‘hibernate’. I figure they decided that NVME means resume from hibernate is ‘good enough’ and modern standby is such a power hog that they can’t pull it off.
Problem in Linux is that they view SecureBoot as a promise they cannot keep if they resume from disk, so they block hibernate if SecureBoot is enabled, making it hard to bank on as a reliable recourse.

Zombie processes do not use resources, well, a little, it’s basically an entry describing how it exited.
The parent process is the thing keeping the zombie entry open. Killing it’s parent should work if they bother you.