Seems one line of code taking care got accidentally removed during modifications.
It will be back next patch :)

This is a problem, seems you suffer this issue
https://bugs.chromium.org/p/chromium/issues/detail?id=626534
and our UI middleware "Coherent UI" is using Chromium to render our UI.
We do not know if and when this middleware gets updated to a new chromium version again.
Maybe when you upgrade the OS again it will work again,
otherwise it might take a while before it can be fixed,
because it is not directly in our hands.

Sorry for all inconvenience.

I did a look at the logs but despite the typical load NullRef issues caused by Unity MonoBehaviours, there seems to be nothing harmful.
So I do not know exactly what we are looking for.
Anyone else an idea?