“Page Array” displaying in title bar on Front Page

The issue is that the text “Page Array” is displaying in the title bar instead of what was previously there, which was just a “|” separator.

I’m trying to puzzle out why this issue appeared…it came up as I was doing some maintenance work on this website, https://kpfa.org/ , updating some Wordpress REST API calls to the current syntax…but I can’t trace this back to anything I changed.

Has anyone experienced this issue, or do you have suggestions about how to go about debugging it, or override it?

This theme was built using Sage.

Any advice is much appreciated. This post has some information but I couldn’t track down a function that was causing the issue: https://wordpress.org/support/topic/home-page-title-displays-title-tagline-and-the-words-page-array/