Hi @themefisher, @jacobproffer,
To be clear: for the specific case of @edrex’s site, it was breaking because of the misconfigured taxonomy:
category = ""
It should have been breaking pre-
0.57. Some of the changes to Hugo since is what enabled it to break, as it should have been doing all along. In fact, removing the config line makes the site work again. No other changes were required, for this specific case.
.Pages variations are documented here: https://gohugo.io/variables/site/#site-pages-compared-to-pages
If you are having problems unrelated to a misconfigured taxonomy, you are welcome to open your own topic here.