The questioner of this problem at UDN wants to create a Precomputed Vosability Volume with the deformed volume.
When Extruded Precomputed Vosability Volume is used, the cell will not fill this volume.
Error occurred in this project.
1. Precomputed visibility volume spawn to level
2. Edit the Precomputed Visibility Volume.using extrude and move
3. Enable Precomputed visibility in World settings
4. Enable Precomputed visibility cells visibility in Show
5. Build to level
6. Precomputed visibility cells generated from extruded volume is insufficient
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-52546 in the post.