"Self-Shadowing" on Tessellated ground broken from 4.18 to 4.21?

While going from 4.18 to 4.21 the self-shadowing on my snowy deformed ground stopped working for point lights.

Is there a simple setting I’ve forgot somewhere? Cast shadows is on for all lights. They are set to movable.

I’ve searched for clues and the closest I’ve found is this, but there’s no mention of point lights in there even:

It’s not quite the same material - I got the snow trails blueprints from the marketplace to replace my own solution made in 4.18, but even so, it shouldn’t matter since the spotlights seem to work still.

Any other recommendations for settings in this use-case would also be appreciated!