John Mueller, a Google search advocate, who we all know so well if you read this site. He said he will use Bing to debug Google issues. He said on Twitter "I often use Bing when debugging."
John added "it shows if it's just Google doing something weird, the site doing weird things, or if it changed over time (search engines index at different rates, faster/slower doesn't matter)." This is "one of the simplest & fastest checks to do" he said.
It makes sense, if both Google and Bing are having the same issues with a specific site, it is probably an issue with the site and not the search engine.
Here is that tweet:
I often use Bing when debugging. It shows if it's just Google doing something weird, the site doing weird things, or if it changed over time (search engines index at different rates, faster/slower doesn't matter). One of the simplest & fastest checks to do.
— 🍌 John 🍌 (@JohnMu) September 1, 2021
It makes sense, in hindsight...
Forum discussion at Twitter.
Update: Bing does the same thing with Google:
I often use Google when debugging. It shows if it's just Bing doing something weird, the site doing weird things, or if it changed over time (search engines index at different rates, faster/slower doesn't matter). One of the simplest & fastest checks to do.
— Fabrice Canel (@facan) September 2, 2021
