Would you mind trying to run this script, since you are running 2021-12, use the v19 of the script.
Edit: forgot the link [How to] Get libwidevine working in OSMC kodi 19?(Netflix, Disney+, viaplay....)
I might be way off but, what i see in the logs is a n unpatched version of the needed system libraries.
Libc-bin version in your logs 2.28.10
Mine 2.28.10.1
So run my script restart and download the latest libwidevine from helper.