WORLDEDIT-3643 - Reported by rob5251

SpongeForge: 1.12.2-2586-7.1.0-BETA-2882
Forge: 2586
WorldEdit: 6.1.9-SNAPSHOT

If you select a chunk (or any area) and try to regenerate it with //regen it will say "region regenerated" in chat, but no actual effects take place.
Checking the server logs reveals nothing notable, only the command being entered into chat.