Description:

Using Terrain tools can result in states where selected objects show no active or available tools, resulting in a broken state where the user cannot interact with the selection or see why.

Repro Steps:

1. Activate a Terrain tool
2. Via the Hierarchy, select a non-Terrain object

Actual Results:

The object becomes selected, but no tool is presented as active or usable

Expected Results:

The Terrain Tool is deactivated, falling back to the last-used standard tool (move, rotate, scale)