Interface as a function parameter does not get set unless class directly inherits the interface

UE - Gameplay - Blueprint - Mar 16, 2017

When a function takes an interface as a parameter, calling that function from a blueprint implementing the interface does not recognize the parameter unless the blueprint's parent class directly inh ...

Placing a Physics Constraint Component in an Actor Triggers a Warning During PIE When There Are No Constrained Components

UE - Simulation - Physics - May 15, 2017

A warning is appearing in the output log during PIE when an actor contains a Physics Constraint component that does not have any constrained components set. This did not occur in 4.15.2, this is a ...

Cannot add to Override Materials array of a Static Mesh Component

UE - Graphics Features - May 23, 2017

Materials cannot be added to the Override Materials array in a static mesh component because attempting to add elements to the array fails. Regression: Yes - using the plus button to add to the arr ...

RecastNavMesh fails to delete when grouped with NavMeshBoundsVolume - Top Down project

UE - AI - May 31, 2017

While testing in //UE4/Release-4.16 CL 3466753 in Binary – I encountered an issue when deleting NavMeshBoundsVolume and RecastNavMesh. The NavMeshBoundsVolume is deleted but the RecastNavMesh remain ...

Editor crash when Landscape Comp. LODBias set to value greater than 0

UE - LD & Modeling - Terrain - Landscape - Mar 20, 2018

When LODBias for a landscape component is set to anything greater than zero, the editor will crash. Reproduced in 4.19.0 CL 3944462 and 4.20 Main. Not able to be reproduced in 4.18.3 CL 3832480. T ...

PressMethod is not called in UButton::RebuildWidget()

UE - Editor - UI Systems - Slate - Nov 5, 2018

The void function UButton::RebuildWidget() does not call PressMethod when rebuilding the widget. Tested  4.19.2 (CL- 4033788), 4.20.3 (CL - 4369336), 4.21 (CL - 4537669), 4.22 (CL - 4531805) ...

Hot Reload cannot be performed when using the DebugGame Editor configuration

UE - Foundation - Cpp Tools - Hot Reload - Dec 31, 2018

In 4.21.1 it is no longer possible to perform a Hot Reload when the game is open in the Editor and using the DebugGame Editor configuration. REGRESSION: Yes. A Hot Reload was possible in 4.20.3 whe ...

OnAudioPlaybackPercent doesn't work after restarting the project

UE - Audio - Feb 7, 2019

Using the OnAudioPlayback event in Blueprints does not work when playing the audio component its connected to while PIE, after restarting the project. Tested in 4.20.3 (CL - 4369336), 4.21.2 (CL ...

"Activation" and "Trigger" keywords are not allowed as a subcategory

Tools - Jul 1, 2019

Using Activation and Trigger as subcategories names does not work in the Details Panel. Tested in 4.21.2 (CL - 4753647), 4.22.3 (CL - 7053647), 4.23 (CL - 7208101), 4.24 (CL - 7216880) ...

DisplayThumbnail doesn't work with TArray

Tools - Jul 8, 2019

The DisplayThumbnail metadata UProperty specifier does not work on TArrays with the type of FSoftObjectPath. Tested in 4.21.2 (CL - 4753647), 4.22.3 (CL - 7053647), 4.23 (CL - 7224811), 4.24 (CL - ...