Unreal Engine Issues

UAssetClassProperty doesn't handle placeholder classes and breaks Blueprints that use ClassAssetIDs

Editor crash in blueprint after compiling Post Process Settings node setings

Adding a variable of Post Process Settings structure to a blueprint causes the editor to crash when the blueprint is compiled. Regression: Yes - Editor did not crash on compile in 4.17.2 (CL 365890 ...

Static variable declaration causes unresolved external errors when calling FRootMotionMovementParams functions

Attempting to call a FRootMotionMovementParams function results in an unresolved externals error on compile because of the static FVector RootMotionScale variable. Workaround: In source, removing s ...

World Condition FWorldConditionQuerySharedDefinition fails to Link in builds in Unreal Engine 5.7

In FWorldConditionQuerySharedDefinition::PostSerialize, if (Ar.IsLoading() && SerializedObject != nullptr) the SerializedObject is currently only used for debug logging within Link() and is not ...

DataTable with structures containing TArray and TMap keeps increasing memory while no rows are selected

When using a DataTable based on a structure that includes TArray or TMap, if a row is not selected, the memory usage will continue to increase. This is because in SDetailsViewBase::Tick, ForceRefr ...

Ensure undoing pin split - Found K2Node_CallFunction_429 ('K2Node_CallFunction') that does not belong to EventGraph.

REGRESSION: Yes, does not occur in 4.17.2 Ensure occurs when undoing the splitting of a pin. ...

Custom Node interprets MaterialAttributes inputs as float3

It seems that the Material Editor's Custom nodes don't handle inputs of type FMaterialAttributes correctly, and instead interpret them as float3. Using Material Attributes as an input to a Custom E ...

Only exactly matching structures are considered compatible

in UE 5.0.2 open TestActor Blueprint compile correct.  but in UE 5.1 Blueprint Compile not correct ...

Exported DataTable as CSV includes a unnecessary string of random characters for Columns

Exporting DataTable to CSV will include a string of random characters. ...

The nativized 'Array_Get' custom thunk implementation fails to properly initialize the item returned in the invalid index case.

FCustomThunkTemplates::Array_Get() fails to properly initialize a default item when the index is invalid: Item = U{}; That will leave the item uninitialized (e.g. UDS types). Should be using the ...