Removing a parameter from a blueprint function in a library can cause actor classes calling it to lose their parent or instance data

UE - Gameplay - Blueprint - Oct 4, 2018

Compile errors caused by an actor calling a function with something hooked up to a removed parameter can cause that actor to lose it's place in the hierarchy. Typically, the actor will be fixed once ...

Construction script in parent blueprint calling function in child blueprint resets upon compiling child blueprint

UE - Gameplay - Blueprint - Apr 11, 2016

If the construction script of a parent blueprint calls a function within a child of that parent in the construction script, compiling the child blueprint will cause the parent blueprint to incorrect ...

Moveable/Stationary Point Lights do not render in Orthographic View

UE - Graphics Features - Aug 25, 2016

When using an orthographic camera all point lights set to movable or stationary stop rendering while playing in the editor. This is also broken in standalone game. Note I've attached the project f ...

Adding a function to a BP Component causes compile errors in BPs that use that component

UE - Gameplay - Components - Aug 28, 2015

Adding a function to a Blueprint component causes other Blueprint that use that component to have Errors and must be re-compiled. ...

Shortcut(Ctrl+W) do a duplicate action in Blueprint Interface function list even if threre is no duplicate/copy action in the context menu.

UE - Gameplay - Blueprint - May 10, 2017

Blueprint Interface functions have no duplicate/copy context menu but still shortcut (Ctrl+W) is working and making duplicated arguments. ...

Landscapes do not Render when used with Lighting Scenarios on Mobile

UE - Platform - Mobile - May 15, 2017

Landscapes disappear using Lighting Scenarios when deployed to a mobile device. When playing in the editor using the mobile previewer, everything looks as expected. It only occurs when deployed to ...

Custom Event functions cannot be called in sublevel event graphs if sublevel is not visible

UE - Gameplay - Blueprint - Aug 1, 2016

Calling a custom event in a sublevel blueprint of a sublevel that is currently hidden will not show the custom event's function in the context menu. Regression (no) issue (does) occur in 4.11.2 ...

Level sequencer's play to(second) function not working as expected

UE - Anim - Sequencer - Aug 22, 2019

The function Play to(seconds) does not functions as it's tooltip implies. "Play the sequence from the current time, to the specified time in seconds". The function instead snaps to the specified tim ...

Breakpoints don't work in Anim Node Functions

UE - Anim - Runtime - Anim Blueprints - Jun 27, 2023

Anim node functions are difficult to debug because breakpoints don't get triggered, and printing is difficult from within the function too. ...

AGameSession Overridden Functions Not Being Called

UE - Networking - Jan 4, 2017

Functions such as BeginPlay that are overridden in a Game Session class do not seem to be getting called. ...