Alright… so, I’ve narrowed this down by trial and error, and discovered what appears to be the conflict:
The featured image itself is not the conflict. However, when I enable the use of “Sections” on the page, that is when the page title disappears (despite not having disabled the page title). That option is definitely not enabled. I have yet to even use that add-on’s options.
Thus, the ONLY difference between the pages that show the title and not, is the use of sections on the ones that are hiding it.
How can I override this so I can use/see both?