CapsuleComponent with CCD on will push and pull any simulated physics objects when close but not in contact with the capsule

UE - Gameplay - Jul 21, 2015

When using a capsule component for the character with CCD enabled there can be a force that pulls or pushes simulated meshes that are never touched by the capsule. Demonstration video attached. As ...

Reflection Captures when used with levels do not pass color of the reflection

UE - Graphics Features - Mar 7, 2015

When using a box or sphere reflection capture with a map that has level setup can result in the reflection capture losing any color values. The reflection will still show but now be block where when ...

Event tick not firing when in an actor component that is added to an actor

UE - Gameplay - Blueprint - Aug 22, 2017

When using actor components, if you delete a node, such as event tick and then add it to an actor, even if you modify the component again, such as adding the event tick event back, the component wil ...

Crash after network disconnection/pulling network cable

UE - Networking - Jul 11, 2019

A very unfortunate bug shipped in 4.22 that causes a crash in many cases when a client is disconnected from the network, such as when unplugging the network cable. This will be a cert failure on con ...

Dragging Audio assets onto the Sequencer timeline will create a new audio track when dropped onto an object's audio subtrack

UE - Anim - Sequencer - Aug 12, 2019

Dropping audio assets onto audio subtracks in the timeline adds them to a regular audio track instead.  ...

A project on Mac that includes a static library will continue to use the old cached version of the library after the library is updated.

UE - Foundation - Cpp Tools - UnrealBuildTool - Sep 9, 2016

If a static library that is included with a UE4 project is changed, the new version of the library is not used when the project is built again. Instead, the original cached version of the library is ...

It's possible to create a locked state on a rigidbody by creating a TransientField that will keep the rigdbody Sleeping even after it leaves the Field's area of influence

UE - Simulation - Physics - Sep 5, 2024

The licensee found a way to lock the state of a rigidbody as PBDRigid->ObjectState() == EObjectStateType::Sleeping by subjecting it to a particular transient field composed of a RadialFalloff and a ...

If a function that takes a custom struct as a parameter is changed and a hot reload performed, any variables in Blueprints that are of that custom struct type will disappear and no longer be usable.

UE - Gameplay - Blueprint - Aug 27, 2015

After creating a custom struct in C++ and adding a variable of that struct type to a Blueprint, hot reloading a code change that involves altering a function that takes the struct as a parameter res ...

SceneCapture2D Component Show Flags that are Modified in a Blueprint initially are Copied not Referenced

UE - Graphics Features - May 17, 2019

If you disable show flags in a SceneCapture2D component of a Blueprint, trying to re-enable them in the Blueprint will not update instances in a level. Anything that was left alone will change along ...

Wild card pins do not update when other pins on the same node have been used

UE - Gameplay - Blueprint - May 5, 2017

Wild card pins do not update when other pins on the same node have been used. If the other pin on the inputs node is connected, the other wildcard pin(s) will no longer update back to wildcards if ...