If a Box Collision component is set to simulate physics, calling "Set Box Extent" causes the editor to crash.
Setting Collision Enabled for the box component to "Physics Only" or "Query and Physics" prevents the crash from occurring
Yes - crash does not occur in 4.14.3 (CL 3249277)
Editor crashes when Set Box Extent is called
No crash occurs when updating box extents at runtime
Head over to the existing Questions & Answers thread and let us know what's up.