Hi @rmurchshafer and everyone
Thankyou for identifying this! We started receiving reports from our users yesterday, with exactly the same set of circumstances.
One of our staff edited a page in a course that had course pacing enabled. Students/learners began reporting that content was not available (we mistakenly though this was related to module prerequisites, and didn't look at 'Assign to' because as has been noted it's not visible if course pacing is enabled). We ended up duplicating the non-working page and deleting it). The duplicate seemed to work ok. But we've had further reports today (possibly because we , we had further reports today.
The symptoms for students were:
"You do not have access to the requested resource."
"That page has been disabled for this course"
Student view - you do not have access...
'Assign to' missing after disabling Course Pacing