Native struct types that declare one or more non-UPROPERTY fields are not initialized with the default value from a modified Blueprint CDO.

Gameplay - Blueprint - Feb 12, 2020

Dynamically-spawned instances of a Blueprint class go through an optimized property initialization pass (see UBlueprintGeneratedClass::BuildCustomPropertyListForPostConstruction() and InitProperties ...

Unable to input with IME in widget component.

Tools - UMG - Feb 12, 2020

Unable to input IME text in widget component, but able to input IME text in textbox like UMG designer.  It works fine until 4.21, however it wasn't able to work after 4.22. Workaround: void FSla ...

BP - Nativizing a UMG widget hierarchy in which a child widget of another widget BP type has the "Is Variable" box unchecked will result in a crash at runtime.

Gameplay - Blueprint - Jan 28, 2020

When the "Is Variable" box is unchecked for a BP-typed child widget, a variable will not be created at Blueprint compile time to reference the child widget in the nativized widget BP class. This bre ...

BP - Nativized builds will incur data loss in a Blueprint class that contains more than one ChildActor component and for which each had its child actor class set in the Details tab before being renamed away from "ChildActor" in the component editor tree.

Gameplay - Blueprint - Jan 27, 2020

Child actor component templates, when nativized, end up being owned by the converted Blueprint class object, rather than the child actor component template. Furthermore, we don't regenerate the chil ...

BP - Nativized build will crash at runtime if a non-nativized child that inherits from a nativized parent containing a ChildActorComponent sets the CAC class to a non-nativized child of a nativized BP class.

Gameplay - Blueprint - Jan 26, 2020

Current workaround: Add a dummy variable to either BP_Owner_Child or BP_CAC_Child to force one of the two to be nativized. ...

UE4 viewport stutters when zoom in to closest point

Tools - Jan 17, 2020

When zooming in as much as possible in UE4's viewport, I notice a strange stutter almost as if the viewport is hitting a limit.  Please watch the attached screencapture. UE4_zoom_in_stutter.mp4[Ima ...

Character Movement Mode in Water Volume is affecting all clients

Gameplay - Player Movement - Dec 16, 2019

Strange behavior concerning Character Movement Network Replication and a Water Physics Volume.  Upon entering water volume, Character Movement mode is set to swimming, however if more than one clien ...

Mentioning "_Validate" suffix in code comments to function names causes Compiler error

Core - UnrealHeaderTool - Dec 13, 2019

When mentioning the _Validate Suffix in code comment, Visual Studio compiler throws an error. ...

Sub Instance Root Motion issues

Anim - Dec 10, 2019

Using multiple Sub instances with root motion does not behave as expected. With both the parent and sub instances set to 'Root Motion from Everything': In 4.22, too much root motion occurs. In ...

Grandchild actor with IsEditorOnly enabled is duplicated during save the level.

Gameplay - Components - Dec 6, 2019

IsEditorOnly is not reflected in grandchild actor when parent/child/grandchild are constructed with ChildActorComponent. This causes the issue that actor will increase incorrect when save the level. ...