Issue:
When attempting to resize a terrain brush it would lock up and become unresponsive to mouse movement. The bug seems to be isolated to only the Sculpt, Smooth, and Flatten tools. You are able to resize the brush through the UI without issue, however when you use the hold B to resize shortcut it becomes unresponsive. It is able to still receive click input but the location at which it does it is incorrect and also no longer responds to mouse movement. The issue persists until you reboot studio, after the bug is active all the other brushes also become unresponsive. Switching between brushes and trying to turn brush on/off doesn’t resolve the issue.
Replication:
Doesn’t matter which place file you use, you can just open a blank baseplate. Open Terrain Editor and select either Sculpt, Smooth, or Flatten Tool. Resize the brush by holding B and moving your mouse. Once you let go it should become unresponsive to mouse movement.
Studio Version: 0.652.0.6520764 (64bit)
Video Demo: