Regardless of FoxyProxy configuration, no connections attempt to use any proxy server.

Firefox Nightly 122.0a1 (Build #2015990567), a2268afaa0+
Huawei Mate 20 Pro, Emui 12 (Android 10)
My FoxyProxy was updated to 8.2 today, before that everything has always worked fine.
Unfortunately, I don't know which version I had previously, and sideloading other versions to test is impossible on android as far as I know.