Desktop wakes up immediately after suspend

As the title says. I dual-boot Windows and Bazzite, and this only happens on the Bazzite side - when booted into Windows, it can sleep normally.

I've disabled Wake-on-LAN and Fast Boot on the Windows side, as well as Fast Boot in the UEFI (there are no WoL settings there). Also disabled WoL in Bazzite.

From googling, I disabled every device in /proc/acpi/wakeup searched for "Wake" in dmidecode and all I found was Wake-up Type: Other in my motherboard:
Handle 0x0001, DMI type 1, 27 bytes
System Information
    Manufacturer: Gigabyte Technology Co., Ltd.
    Product Name: B650I AORUS ULTRA
    Version: -CF
    Serial Number: Default string
    UUID: ####
    Wake-up Type: Other
    SKU Number: Default string
    Family: B650 MB


I've also attached
journalctl
logs - everything from when the suspend is first requested to NetworkManager reporting that a wake was requested.

System specs:
CPU: AMD Ryzen 7 7800X3D 4.2 GHz 8-Core Processor
CPU Cooler: Thermalright AXP120-X67 59 CFM CPU Cooler
Motherboard: Gigabyte B650I AORUS ULTRA Mini ITX AM5 Motherboard
Memory: Corsair Vengeance 64 GB (2 x 32 GB) DDR5-6000 CL40 Memory
Storage: Western Digital Black SN850X 4 TB M.2-2280 PCIe 4.0 X4 NVME Solid State Drive
Video Card: Asus ProArt OC GeForce RTX 4080 SUPER 16 GB Video Card


Any other debugging I should try? I'm running out of ideas. 🤷‍♂️

(Also to head off the question: I'm only looking to suspend my desktop for power-saving reasons when I'm not using it. It's not a deal-breaker, but I'd really like it to work.)
log.txt44.64KB
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