Can anyone else not assign custom hotkeys for Landscape tools?

We’ve been bashing our heads together about this for the better part of 2 hours now.

Any custom-assigned hotkeys for Landscape tools do not seem to work at all for switching.

Example:

Unbound Viewport Bookmark keys 1-3

Rebound them to Sculpt, Smooth, Flatten

When pressing 1, 2 or 3 nothing happens.