Unreal Engine Issues

Blueprints break when implementing a duplicated BP interface along with the original

When duplicating a blueprint interface, the GraphGuids of the original BP interface's function graphs are unchanged: function graphs across the two BP interfaces now have the same GraphGuid. This is ...

Components added to an Actor Blueprint may not be propagated to Actors inside World-Partition Level Instances

When a world partition level (but streaming disabled) is placed as a LevelInstance in another world partition level, actors in the inner level are cooked with an outdated component hierarchy until t ...

Complex Landscape Collision is always used

For landscapes, both the simple and complex collision are used when simulated against.  ...

Project fails to package when given the name "Test" and Encrypt Pak ini Files is enabled

Project fails to package when given the name "Test" and Encrypt Pak ini Files is enabled Error: UATHelper: Packaging (Windows (64-bit)): ERROR: No target name was specified on the command-line. ...

Getting Fullscreen or Windowed Resolutions doesn't fully execute on Linux

When using "Get Supported Fullscreen Resolutions" on UE when built with Vulkan, no values are printed out. This is an issue with any platform that builds UE with -vulkan, not just Linux.  In Engine ...

iOS Device Orientations Inverted

The EDeviceScreenOrientation landscape values appear to be inverted on iOS based on the comments in the code. i.e.EDeviceScreenOrientation::LandscapeRight // The orientation is landscape with the h ...

Second controller input doesn't work setting client mode on PIE.

When two controllers connected, player2 input is disabled in client mode in PIE. It worked correctly in 4.25, but it has been wrong since 4.26.  Digging into FSlateApplication::ProcessKeyDownEve ...

An array of structures variable has its values reset when the structure is modified without recompiling the blueprint

An array of a structure that has been modified without the array's blueprint being complied results in the values of the array element being reset. Compiling each blueprint that has the array of str ...

Objects in AR not synced well with camera movement on iOS

[Feature Request] Hardware video decoding on Windows DX12

Currently, all DX12 video decoders on Windows use software decoding. On the other hand, if the engine is running on DX11, developers can use this by enabling the "Hardware Decoding" option under "Ex ...