it’s working properly for me now, might want to check and update the thread
Happen to my site today as well: https://genshindb.org
I’ve try to deactivate it and then reactivate it again, still no avail. After found this thread, I’ll just take conclusion that the problem is jetpack itself since there’s so many people getting same problem today.
Will keep an eye to this thread until problem resolved. WordPress 5,7 – Jetpack 9.5
It’s a good thing that I search the error message before opening new forum thread. I also suffer from the same error, was panicking since last night. For anyone who got same problem just disable Jetpack sitemap through Jetpack > Settings > Traffic, and then disable Generate XML Sitemaps options.