This will happen frequently after using the search to pull up an opportunity.

The stage is missing and cannot be re-selected.

Exiting the opportunity window and searching again (and again and again) will sometimes end up displaying the stage correctly.

Exiting the opportunity window and finding the opportunity card on my Kanban will display the stage correctly.

Clicking the opportunity to-do from the focus area will display the stage correctly.

Currently I only notice this after using the cmd+K/search bar to locate the opportunity with their first name - the blank stage.