Noting another thread that looks like it’s covering the same issue: [RESPONDED] Arch hibernation woes on AMD 13
Final solution for me was a /usr/lib/systemd/system-sleep/ script as well.
One interesting point to add: the first version I tried (inadvertently) and had success with just used rfkill block all; sleep 1 in “pre” and sleep 1; rfkill unblock all in “post”.
Next week or so will be testing a version with modprobe and modprobe -r.