Modules won't show in Navigation

crookd1
Community Novice

An instructor called for help with an issue that (so far) I've not been able to find documentation for.  The problem went away -- but I'd like to know if anyone can point me to official guidance on this.

Problem: Modules not showing in Navigation (student view)

Modules have an invisible icon next to them (instructor view)

Confirmed: Modules are in the navigation in Settings

Confirmed: Modules and all contents are published -- green check-mark icons everywhere.

Observation: Modules contain discussions and pages.

Solution (though I don't know why):

Added 'Pages' to the Navigation.  Once that was done, modules started showing-up in navigation as well.

In my own test course -- I could not reproduce this issue.  Very curious if anyone has experienced this or has any wisdom on it.

Thank you!