Paragon Character TwinBlast makes Unreal Editor crash

Windows 11, Unreal Editor 5.5.
Steps

  1. Import “Paragon: Twinblast” to a project.
  2. Either double click “/All/Game/ParagonTwinblast/Characters/Maps/TwinBlast” or double click “/All/Game/ParagonTwinblast/Characters/Heroes/TwinBlast/Skins/Tier2/SummerTime/Meshes/TwinBlast_SummerTime”.
    “TwinBlast_SummerTime” skeletal mesh makes Unreal Editor crash with error message:
    Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 783]
    Array index out of bounds: 61314 into an array of size 54111

Can anyone please confirm the crash at least?

Its not ambiguous at all. Something within some file is causing an array to go out of range.

If you want to debug why, you have to build your engine version from source. Put a line break from VS on

And figure out what called it and what is actually out of range.

Don’t count on epic to do anything. Particulalry if the issue is the content they provide for free.
(Chances are its an engine bug, due to compatibility issues between versions).

Confirmed that it crashes only on the summer time mesh of the Twin Blast character. Havent checked what exactly causes it yet. But my guess is in any of the material, as it reuses the base skeleton of twin blast character (which does not crash)