Building completely disabled on my island, traced to a handful of wall props

General Issues and Bug Reporting
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Summary

Building is completely disabled on my island. Allow Building is set to All, but no player can place any structure. The build hologram appears but left clicking does nothing. Reproduced down to just ten wall props on an otherwise empty map.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Devices

Steps to Reproduce

  1. Open my project and enter Play Mode or Launch Session.
  2. Equip a build piece (wall, floor, ramp or cone).
  3. Aim at open ground and left click.
  4. Nothing is placed. The hologram is visible but no structure appears.
  5. Delete everything in the level. Building now works normally.
  6. Add back only the wall props, even just ten of them on an empty map.
  7. Building stops working again immediately.

Expected Result

Players should be able to place structures normally, since Allow Building is set to All and infinite building resources are enabled.

Observed Result

No structure is placed. No error message appears. There is a small freeze at the exact moment of the click. This happens for every build piece, everywhere on the island, including open ground far from any prop.

Platform(s)

PC

Island Code

8674-8536-0838

Additional Notes

Things I have already ruled out:

  • Allow Building is set to All. Maximum Building Resources is 500 with Infinite Building Resources enabled, and the HUD shows infinite materials in game.
  • I had six Mutator Zones. I enabled Allow Building on all of them, then deleted them entirely. No change.
  • No Class Designer or Team Settings and Inventory device exists in the project.
  • I deleted the Island Settings device and placed a fresh one. No change.
  • I removed all vehicle spawners and all Item Placers. No change.
  • Building works normally in a brand new Blank project, so the client is fine.
  • I reduced the wall count from around 1600 by roughly 1000 using larger scaled props. No change.
  • I migrated the project to a new UEFN project, both by manual file copy and by copy paste through the editor. The problem came with the content.

The Log also flags five Item Placer devices with illegal references to Weapon Wraps. I do not think this is related, but mentioning it for completeness.

Project name: allgun
Creator name: TRIX by boxes