Brief black box flashes at bottom-centre of screen, no reproducible trigger - 42.20

Summary

A brief black rectangle randomly flashes at the bottom-centre of the screen for 1-2 seconds, reproducible in the launched session from the editor and the published version.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

UI/Tools

Steps to Reproduce

  1. Open the island in UEFN
  2. Launch a Play session (PIE or published)
  3. Wait - no specific trigger found; it can happen while standing idle, mid-match, in the pre-game lobby, or during end-of-game teardown

Expected Result

No unexpected UI elements should render when nothing is displaying a message

Observed Result

A black rectangle briefly appears at the bottom-centre of the screen, then disappears on its own after 1-2 seconds. No correlation was found with any placed device, HUD Message Device, timer, or player action after extensive testing. Notably reproduces in any PIE Play or published sessions. Consistent screen position (bottom-centre) and a consistent short duration each time.

Platform(s)

PC (also occurs in the published build; a second player on Xbox in the same match did not see it during that session)

Windows 11 Pro
Version 10.0.26200, Build 26200

Platform: Windows 11 (25H2) [10.0.26200.9550] (x86_64)
Version: 6.0.0-58011042+++Fortnite+Release-42.20

Island Code

8420-9532-1221

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Additional Notes

42.20 release notes list several other UI-rendering fixes this cycle (SGUI depth ordering for in-world UMG widgets, multi-instance widget Verse-binding, HUD clearing on refresh); flagging in case this is a related regression in the same area.