Non-staff users are missing link to Messages in UI

I updated our Discourse instance to 2.9.0.beta10 but didn’t turn the new sidebar feature on. Our users have noticed that the Personal Message icon has since disappeared
in the menu bar when clicking the upper-right hand avatar, although as admin I can still see mine. Was the icon removed due to the new sidebar menu launch? Any way to get it back? Thank you!

Admin menu bar:
admin bar

Regular user menu bar:
user bar

Thank you!

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