Serious issue with scenegraph cannot launch sessions

General Issues and Bug Reporting
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Summary

So i haven’t worked out the full issue yet but its something with prefabs i believe

You cannot launch a session at all

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Stability

Steps to Reproduce

Unsure as im new to scenegraph

Expected Result

it should work

Observed Result

its broken

Platform(s)

pc

Additional Notes

Errors are these

[2025.08.02-13.48.26:865][692]PlatformCook: Error: LogWindows: Error: appError called: Assertion failed: !Obj->HasAnyFlags(RF_NeedLoad|RF_NeedPostLoad|RF_ClassDefaultObject) || bIsOwnedByCDOOrArchetype [File:Z:\UEVFS\Root\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 3713]
Attempting to replace an object that hasn’t been fully loaded: SceneGraph_Stuff-Brick_SG_Mesh /62a1fedb-4c80-262a-e311-62806d033cff/Brick_Breaker_V2.Brick_Breaker_V2:PersistentLevel.LevelEntity.LevelEntity.BB_Level_1_Bricks_s5v3asazbyig1_2047881537.entity_adatgq5ufj07_1098283249.SceneGraph_Stuff-Brick_SG_Mesh_0 (Outer=entity /62a1fedb-4c80-262a-e311-62806d033cff/Brick_Breaker_V2.Brick_Breaker_V2:PersistentLevel.LevelEntity.LevelEntity.BB_Level_1_Bricks_s5v3asazbyig1_2047881537.entity_adatgq5ufj07_1098283249, Flags=0x00283009)
[2025.08.02-13.48.26:866][692]PlatformCook: Error: LogWindows: Error: appError called: Assertion failed: !Obj->HasAnyFlags(RF_NeedLoad|RF_NeedPostLoad|RF_ClassDefaultObject) || bIsOwnedByCDOOrArchetype [File:Z:\UEVFS\Root\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 3713]
Attempting to replace an object that hasn’t been fully loaded: SceneGraph_Stuff-Brick_SG_Mesh /62a1fedb-4c80-262a-e311-62806d033cff/Brick_Breaker_V2.Brick_Breaker_V2:PersistentLevel.LevelEntity.LevelEntity.BB_Level_1_Bricks_s5v3asazbyig1_2047881537.entity_adatgq5ufj07_1098283249.SceneGraph_Stuff-Brick_SG_Mesh_0 (Outer=entity /62a1fedb-4c80-262a-e311-62806d033cff/Brick_Breaker_V2.Brick_Breaker_V2:PersistentLevel.LevelEntity.LevelEntity.BB_Level_1_Bricks_s5v3asazbyig1_2047881537.entity_adatgq5ufj07_1098283249, Flags=0x00283009)

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Turns out its material issue.

So when you create a prefab and have mesh_components i have found the following

If i apply a material instance i created which makes the mesh invisible it crashes uefn ect all get closed

if i apply a material ie normal color and overide the original then itll work initially but then when it crashes eventually/or you close and re-open the project thats when the error starts ?

Imma just give my opinion on this but currently ive been using sg for 2 days and tbh the only reason is due to collision detection.

Since then the amount of crashes/bugs is crazy for instance currently you cannot visually see spawned prefabs due to a mesh render bug like imma not try be negative but how are we as creators suppose to feel motivated/incentivized to learn this new system when a basic thing is crashing/breaking the game.

Lastly i feel everything is a task and a half compared to the normal verse way ie in verse ref the bpp then say spawn this prop here in sg its a nightmare and there is not many docs at all for ref/using verse devices with sg things

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