Originally Posted by I am Groot!
Found out the solution and I still can't believe I haven't thought about doing it. Since this issue affected all apps (Firefox was the one the log was pulled off from.), I tried "magisk-EdXposed-YAHFA-v0.4.5.1_beta.4463.-release.zip" instead of "magisk-EdXposed-SandHook-v0.4.5.1_beta.4463.-release.zip" and just like that everything back to normal again.
I will update if anything comes up.
That would have been also my advise. Yahfa is a little bit slower that Sandhook, but it's known to be more stable.
So in general, regarding XPL and any other modules, I'd recommend to use Yahfa. Only if this raises problems or is noticeable to slow on some scenarios you should try Sandhook.
But I'm glad you found out on your own and things are working well now for you
Hopefully this isn't too off-topic.
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