Plugin claims that it works, but doesn't write anything.

TL;DR: The plugin doesn’t work, it doesn’t write the sitemap file for some reason or another (no error messages in PHP log files, most likely suppressed to make it look like it works).

I’ve installed this two weeks ago to hopefully get WordPress to generate a sitemap (Why isn’t this a core feature again?). When I tried looking at the sitemap, the file doesn’t exist. It’s never written and there are no error/warning messages logged, so I don’t even know if it’s shitty coding (supressing error messages usually is shitty coding) or a configuration error (that would be the first one in 8 years now).
Would not recommend until it either gives you an option to see why it’s not working, or actually starts working in an environment that nothing else has trouble with.