When editing multiple Blocking Volumes in geometry mode, only one Blocking Volume will properly update it's collision.
This seems to just be an update issue. Moving or editing any BSP will cause the Blocking Volumes to update. Likewise, hitting Build Geometry will update the Volumes and give the expected results
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Attached video also demonstrates the issue.
1. Drag in 2 blocking volumes
2. In geometry edit mode, select the top face of each.
3. Drag the faces up
*Note that the wireframe shows the edit.
4. Switch to Viemode>PlayerCollision
*Result: Collision does not match wireframe
Expected: Collision should update to match Wireframe representation
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-35590 in the post.