Unreal Engine Issues

UPL addElement and addElements can infinitely recurse if tag is included in inserted data

Inserting element data which contains the same tag as to insert into can create an infinite loop of adding the element to itself. ...

[CrashReport] UE4Editor_Engine!FStaticMeshVertexBuffer::BindLightMapVertexBuffer() [staticmeshvertexbuffer.cpp:495]

User comment from crash group:reimporting fbx 491 void FStaticMeshVertexBuffer::BindLightMapVertexBuffer(const FVertexFactory* VertexFactory, FStaticMeshDataType& Data, int LightMapCoordinate ...

Template_Default.umap and Template_Default_BuiltData.uasset will be changed each time after cook.

Each time after cook the Template_Default.umap or Template_Default_BuiltData.uasset are changed. But if I move Template_Default.umap to the project content folder, they will be the same as the las ...

Crash occur package application which set the StringTable

Crash occur the packaging application which has the title referencing StringTablem. When lunch the application with editor and standalone, it's not crash. It' not occur 4.20, and crash with 4.21 and ...

Python cannot spawn object when running in Ueditor-CMD

It is probably link to the fact the function try to access so GUI object that are not accessible in CMD EditorLevelLibrary.spawn_actor_from_object should work in commandlet ...

Engine crashes with AudioMixer if the sound is disabled in the system

Seems like failure to init SDL device is not being properly propagated and something on the higher level keeps pushing commands to the (non-existent?) audio thread. Paging also [Link Removed] and [ ...

Beam Emitter exhibiting lagging behavior when attached to Camera in BP

Beam Emitter attached to a camera in a blueprint is showing lagging behavior at source and target locations ADDITIONAL NOTES: Have tried to eliminate the lagging through locking source and target w ...

Launching a specific UDN Project with Vulkan Support enabled crashes launching on Quest

When attempting to run the attached Project submitted from UDN, it will crash on launch. If Vulkan support is disabled, the Project will run as expected on Quest. This issue DOES NOT appear to repro ...

When the value of the TMap variable of the child blueprint is changed and compiled, it will restore to the default value of the parent blueprint.

For TMap variables of type struct created in blueprint, if change the default value in child blueprint and compile, it will restore to the default value of the parent actor. This problem does not o ...

If using BP that inherits DataAsset as Value of Map in Struct, it will be replaced with PLACEHOLDER-CLASS after restarting editor.