What is this?

oginId:dc540aec4b919e85f048f6a1f5fe1e61
EpicAccountId:f0ca03984d5a46dd8ea38b5ef3fbc70e

Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerLoad.cpp] [Line: 4470] SubstanceGraphInstance /Game/Environment_Stylized/Assets/LandScape/Ground2/Stylized_Stone_Cliff_With_Sand_INST.Stylized_Stone_Cliff_With_Sand_INST: Serial size mismatch: Got 249, Expected 245

UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_SubstanceCore!Substance::Helpers::SubstancesRequireUpdate() [D:\build\U5M-Marketplace\Sync\LocalBuilds\PluginTemp\HostProject\Plugins\Substance\Source\SubstanceCore\Private\SubstanceCoreHelpers.cpp:3557]
UnrealEditor_SubstanceEditor!FSubstanceEditorModule::RebuildAlert() [D:\build\U5M-Marketplace\Sync\LocalBuilds\PluginTemp\HostProject\Plugins\Substance\Source\SubstanceEditor\Private\SubstanceEditorModule.cpp:142]
UnrealEditor_SubstanceEditor!TBaseStaticDelegateInstance<void __cdecl(FString const &,bool),FDefaultDelegateUserPolicy>::ExecuteIfSafe() [D:\RocketSync\5.0.0-19505902+++UE5+Release-5.0\Working\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:731]
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

Looks like something to do with the Substance Plugin. What were you doing when it crashed? If possible, try disabling the plugin and see if it still crashes.