[ISSUE] Attempting to suspend on Wayland+KDE+nVidia breaks system completely

[z411 <z411@users.noreply.github.com>]

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New issue by z411 on void-packages repository

https://github.com/void-linux/void-packages/issues/46161

Description:
### Is this a new report?

Yes

### System Info

Void 6.3.13_1 x86_64 AuthenticAMD uptodate rrrrmmnFFFFF

### Package(s) Affected

kwin-5.27.7_1, nvidia-535.104.05_1

### Does a report exist for this bug with the project's home (upstream) and/or another distro?

_No response_

### Expected behaviour

When clicking sleep the system should suspend.

### Actual behaviour

When clicking sleep nothing happens, the screen just gets locked.
Instead, the system keeps working but it starts behaving strangely:

1. Firefox stops being able to open new pages or tabs; it seems that the backend of the browser hangs completely.
2. Screen starts freezing randomly for ~15 seconds then unfreezing
3. KDE System settings doesn't start
4. Nothing happens when attempting to change TTY with CTRL+Fn keys
5. Attempting to log out through the GUI freezes the plasma shell
6. Attempting to log out by killing all user processes (`pkill -9 -U 1000`) freezes the system
7. Attempting to reboot with the `reboot` command actually suspends the system (!)

This works normally in Debian+Wayland (I think it has some nvidia-suspend systemd services that might be required?).
It also works normally in Void+Xorg.

### Steps to reproduce

1. Open KDE system menu
2. Click "Sleep"
3. Observe the system start behaving strangely instead of going to sleep