Unreal Engine Issues and Bug Tracker (UE-21912)

Description

When you are in Rendering Preview Level ES2 (Mobile/HTML) and have a level which has a landscape with weight-blended layered material painted on, PIE will crash on Start of or Exit from.

[Link Removed]

From Crash Reporter Descriptions:

UE4QA - Eric K. - Crash on Exiting PIE with Landscape Weight Blended in ES2 Preview Level
Stop after PIE in mobile preview
Stop while in mobile preview
Still crashing while in mobile PIE and hitting ESC to quit.
Stop play
End a PIE session in a new window while using ES2 feature level preview.
Sent in the unattended mode

Steps to Reproduce

Open a Blank Project with No Starter Content
Create a Material called M_Landscape
In M_Landscape, assign 3 different textures to three Weight Blended Layers
Save and Compile Material
In Level, Add a Landscape with default settings
Assign M_Landscape to the Landscape in the level
Create Layer Info for the 3 layers
Paint any amount of blending between the three layers on the landscape
Switch to Rendering Preview Level ES2 (Mobile/HTML)
PIE in selected Viewport
End PIE

RESULTS: CRASH (Sometimes I have experienced on successive tests on Starting PIE as well)

EXPECTED: No Crash

Quick REPRO Open Attached Project, set Preview Rendering Level to ES2 (Mobile/HTML) and PIE

Callstack

UE4Editor_Engine!UPrimitiveComponent::FinishDestroy() [primitivecomponent.cpp:873]
UE4Editor_CoreUObject!UObject::ConditionalFinishDestroy() [obj.cpp:685]
UE4Editor_CoreUObject!IncrementalPurgeGarbage() [garbagecollection.cpp:1019]
UE4Editor_CoreUObject!CollectGarbageInternal() [garbagecollection.cpp:1383]
UE4Editor_CoreUObject!CollectGarbage() [garbagecollection.cpp:1400]
UE4Editor_UnrealEd!UEditorEngine::EndPlayMap() [playlevel.cpp:327]
UE4Editor_UnrealEd!UEditorEngine::Tick() [editorengine.cpp:978]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [unrealedengine.cpp:366]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:2428]
UE4Editor!GuardedMain() [launch.cpp:142]
UE4Editor!GuardedMainWrapper() [launchwindows.cpp:126]
UE4Editor!WinMain() [launchwindows.cpp:200]

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Cannot Reproduce

Component	UE - LD & Modeling - Terrain - Landscape
Affects Versions	4.9

Created	Oct 8, 2015
Resolved	Jun 27, 2016
Updated	Jul 14, 2021

UE-21912

Crash on Exiting or Starting PIE with Weight Blended Landscape on ES2 Preview Level

Crash on Exiting or Starting PIE with Weight Blended Landscape on ES2 Preview Level

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