Unreal Engine Issues

Child actor passes a string to it's parent's overloaded constructor the incorrect string is received

When a child actor passes a string to it's parent's overloaded constructor using an overridden function that returns a string it won't receive the correct string. I have verified that the correct fu ...

Packed level actors and Level instances are sometimes not included in HLOD build on a World Partition Level

Context World Partition - Hierarchical Level of Detail (HLOD) system uses custom HLOD Layers to organize large amounts of Static Mesh Actors and generate a single proxy mesh and Material. Problem T ...

Map actor reconstruction does not reattach external non-root components

For two map placed actors, if one actor B's non root component is attached to another actor A, the attachment is not retained when actor A reruns its construction script, such as when moving actor A ...

[CrashReport] Assertion failed: OLEReferenceCount == 0 in UE4Editor_SlateRHIRenderer!FSlateRHIRenderer::DrawWindows_Private()

This is a regular and longstanding crash in 4.17 that has occurred since at least 4.14. Users have not provided any descriptions of their actions when the crash occurred. There has been some previo ...

iOS Show External Login UI Blueprint Node fails on new iOS devices

I have been trying to test iOS online subsystem functionality for my game and thought that this blueprint node was just broken. This bug will probably catch many UE4 developers that are new to iOS b ...

Static Mesh imported from USD file has empty UV channel

When importing static mesh from USD file then it has the wrong amount of UV channels. Selecting a UV channel shows an empty area in the viewport. Regression: YES - not reproduced in 4.25.3 produc ...

AllowCommandletRendering D3D12 device crash

Client crash on seamless travel in DataReplication with lag

When server traveling, client may crash due to lag while attempting to replicate object/property. ...

Editor crash on close if custom Data Asset is not saved after hot reload.

After creating an editor asset of a custom DataAsset class, if changes are made to to the class and hot reloaded, the editor will crash on close if the editor asset is not saved after the hot reload ...

Variable Reset on Child in level

For a child instance inside of the level, the value of a parent int variable will reset if you add a new variable in the child and if there is a function in the parent that has the child as an outpu ...