Copying a call to a Custom Event or Function in another Blueprint and pasting it in the Blueprint the Custom Event or Function comes lives in will cause a compile warning or failure

UE - Gameplay - Blueprint - Apr 17, 2015

Copying a call to a Custom Event or Function in another Blueprint and pasting it in the Blueprint the Custom Event or Function comes lives in will cause a compile warning or failure. In 4.7.5 it giv ...

Moving forward via the scroll wheel will cause the loss of movement in the viewport

Tools - Apr 30, 2019

When using the scroll wheel to move, the user will gradually come to a stop when going forward and will increase in speed when moving backward. If the user moves forward using this method until they ...

Crash on packaged game. 4.23 will not nativize a class that creates instanced properties inside itself

UE - Gameplay - Oct 1, 2019

Description from the user: up to 4.23 properties nativize normally if they are written in C++ with the Instanced specifier. The discerning difference is that that there was no Blueprint Class itsel ...

The ChaosCacheManager changes the bSimulatePhysics flag from the ObservedComponents and, if deleted, the change will persist, what can lead to confusion as observed physical entities will inadvertently stop simulating physics

UE - Simulation - Physics - Nov 26, 2024

The ChaosCacheManager (CCM) changes the bSimulatePhysics flag from the ObservedComponents and, if deleted, the change will persist, what can lead to confusion as observed physical entities will inad ...

Renaming a Sequencer spawnable actor in the World Outliner will revert on save

UE - Anim - Sequencer - Jul 28, 2017

Renaming a Sequencer spawnable actor in the World Outliner will revert back to the old name on save. Not a regression because Sequencer spawnable actors in 4.16 didn't show in the World Outliner. ...

Calling a parents function that is used in a child blueprint from a spawn actor from class node that is being called back in the parent will cause an error

UE - Gameplay - Blueprint - May 14, 2015

If the user calls a function (We will call it "Parent's Function") from a child blueprint and then turns around and tries to call that implementation of the Parent's Function with in the parent it's ...

Upgrading from 4.22 to 4.23 can break emitter inheritance

UE - Niagara - Sep 20, 2019

Copied emitters will have their inheritance broken when migrating from 4.22 to 4.23.  ...

Destructible Meshes will flicker in a Packaged Game

UE - Simulation - Physics - Destruction - Apr 9, 2015

Destructible chunks will flicker after the DM has been fractured. These chunks will flicker until they are in a sleep state. Using Sensitive Sleep Family will allow this to stay prolonged. Waking th ...

Keep Simulation Changes will persist only a subset of changed properties

UE - Editor - Jan 10, 2025

As per the steps to reproduce, Keep Simulation Changes will often only copy back the most recent property changed on a simulating Actor back to the version of the Actor in the Editor level. It is no ...

The behavior of translucent sorting is different between 4.23 and later.

UE - Graphics Features - Apr 24, 2020

Also, from 4.23 onwards, if you move the mesh back and forth, the order of the  translucent sort will be switched. ...