Cannot see my vertices in vertex mode

When modifying a probuilder object in vertex mode, I am not seeing the yellow or blue squares that show my vertices. Nor do I see similar dots for Face or Edge mode. What am I missing?

What I’m seeing:

What I expect to see - vertex dots like this:

experiencing this too on 2021.3.5f
gets so tiring all these tool set bugs.

Was working great 5 minutes ago… now not.

Gizmos are disabled in the scene view in the screenshot. Could that be why?