Keybind J (stairs) does not switch to build mode from pickaxe/weapon, but works once a piece is already out

Summary

On PC, when a build piece is bound to the key J, pressing it does nothing from the pickaxe or a weapon. The same key works once build mode is already active. Other keys work for the same action (F and G tested). Epic’s help article “Why the ‘R’ Key does not switch to Build Mode when I’m not using the blueprint?” describes the same behaviour for the R key.

Please select what you are reporting on:

Creative

What Type of Bug are you experiencing?

Other

Steps to Reproduce

  1. On PC (French AZERTY keyboard), open Settings > Keyboard Controls. Bind Build: Stairs to J (Wall = P, Floor = I, Roof = N). Apply.
  2. Join a Battle Royale match or a Creative island (reproduced on island 8064-7152-2934).
  3. Equip the pickaxe or a weapon and press J.
  4. For comparison, press P, I or N from the pickaxe.
  5. Equip a wall (P), then press J.

Expected Result

Pressing J switches to build mode and shows the stairs, exactly like P, I and N do for wall, floor and roof.

Observed Result

From the pickaxe or a weapon, J does nothing (tested many times). If a piece is already out (e.g. a wall), J selects the stairs normally.
Other findings:

  • No other action uses J (checked both columns).
  • Stairs bound to F or G work from the pickaxe.
  • J as the secondary bind of Wall does not work, while G in the same slot does.
  • J works for other actions (e.g. Move Forward), so the key itself is detected.
  • Reproduced on two PCs, two accounts and two keyboards. Resetting binds to default on another account did not fix it.
    Game version: ++Fortnite+Release-42.40-CL-59343437

Platform(s)

PC (Windows), French AZERTY keyboard, movement on O/K/L/M

Island Code

8064-7152-2934

Additional Notes

Epic’s help article about the R key describes the same behaviour (key does not enter build mode unless a blueprint is already out). Same symptom is reported on the forum for the F key (“Stairs won’t place”). The issue also occurs in Battle Royale, not only Creative.