It may be connected with BIOS updates too, but probably kernel regression.
I myself have a new Thinkpad T16. I tried Kubuntu and suspend is working, but touchpad is not usable after resume (huge lags, moving cursor just a bit instead of normal functioning).
In Qubes OS after BIOS, dom0 and kernel updates suspend is not working at all. At the resume the laptop just reboots. It’s unfortunate that Xen/Qubes OS is that bad with suspend, because Kubuntu, even old one, suspends and resumes at least on the same hardware.