Hello mfornasa,
I can assure you that hibernation works perfectly with my Beelink SER 9 (BIOS STX.3xx.SER9.V103.P8COMO, 32 GB RAM) under Ubuntu 24.04.3 LTS. (Suspend-to-RAM AND Suspend-to-Disk)
However, it was a very lengthy process to get it working!
It also worked with CachyOS (Arch-based) and KDE/Plasma. (But at least for me, it currently does not work with CachyOS and Gnome).
If you (or anyone else) would like a detailed description of the steps required for Ubuntu 24.04.3 LTS, I can publish it here (or elsewhere?).
But as I said, it’s a long road…