FortDelMarTrack: SplineToSnapTo validation errors return after Rebuilding Track

General Issues and Bug Reporting
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Summary

FortDelMarTrack: SplineToSnapTo validation errors return after Rebuilding Track

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Other

Steps to Reproduce

  1. Open a standard Fortnite UEFN project (Release 43.00, CL 59596594) containing a FortDelMarTrack device.
  2. Open the affected level and select Project → Validate Project.
  3. Observe validation errors: IllegalPropertyOverride for SplineToSnapTo. The property references the track’s own MainSpline instead of the default value None.
  4. In the Outliner, right-click the affected Track actor and select Fix Validation Issues.
  5. Confirm that the affected SplineToSnapTo properties are reset to None.
  6. Save the project and switch to another level.
  7. Return to the original level. UEFN automatically performs Rebuilding Track.
  8. Inspect the same properties again. They now reference MainSpline instead of None.

Actual Result: The validation errors return after the automatic track rebuild. The project cannot pass validation or launch a playtest session.

Expected Result: Fix Validation Issues should permanently resolve the invalid properties, and rebuilding the track should not recreate validation errors.

Expected Result

The FortDelMarTrack device should generate valid track components without creating illegal SplineToSnapTo property overrides.

After using Fix Validation Issues, the corrected properties should remain valid after saving, reloading the level, and automatically rebuilding the track.

Project validation should complete successfully without these errors, allowing me to launch a Fortnite playtest session.

Observed Result

UEFN project validation reports 59 IllegalPropertyOverride errors related to SplineToSnapTo across three FortDelMarTrack devices.

Using Fix Validation Issues temporarily resolves the errors. However, after saving the project, switching to another level, and returning, UEFN automatically executes Rebuilding Track.

This rebuild restores the invalid SplineToSnapTo references to each affected component’s MainSpline instead of the default value None.

The issue was confirmed on DX_Replacement_RRTrack2: all four corrected properties reverted after reloading the level.

As a result, the fix does not persist, project validation remains blocked, and I cannot launch a Fortnite playtest session.

Platform(s)

Windows PC