Unreal Engine Issues

Naming a variable 'LifeSpan' causes the default value to be reset after closing the editor

Customer reported this issue in Salesforce. I repro'd this issue in 4.25.3, 4.25.4, and 4.26. Therefore marking it as not a regression. Renaming the variable something like "LifeTimer" does not res ...

Niagara Ribbons using Two Sided materials are incorrectly lit

Two Sided materials are lit incorrectly on Niagara ribbons. The sides will be flipped of how they should be. ...

Changing a Mesh's Build Scale doesn't update the Mesh's Bounding

This is a regression tested in //UE4/Release-4.27 CL18319896 Changing a Mesh's Build Scale doesn't update the Mesh's Bounding to the same scale. ...

DataTable CSV export; First member of Array not exported if set to default value

When using a struct as a type for TArray and first element of the array has first member variable of the struct set to default, it is not exported to *.csv ...

Child Actors do not replicate to clients when running project with "-game" command

Child Actors do not replicated properly to clients when running a project using the "-game" commandline argument. This does functionality does work properly in PIE and in a cooked build however. Re ...

Staticmesh SectionInfo map is reset when changing LODGroup

Incorrect display of NavLinks when bFailedNavLinks is enabled

When bFailedNavLinkNavLink is enabled in RecastNavmesh, some NavLink points are debugged and others are not depending on the position of the NavLink point. In the sample project, enable bFailedNavL ...

Particle systems have frame rate dependent simulations when Min Time Between Ticks is set, and ticking is managed

Managed ticking when combined with Min Time Between Ticks will cause particle velocity to vary depending on frame rate. ...

Instanced Components variable not returning updated values in the construction script

It is currently not possible to set variable values of an actor component, instanced in the level, by using the "details" pane. The Actor's construction script will only evaluate the variable defaul ...

Trace Hit.Z varies strangely based on trace start/end Z

The Z value of a trace hit will vary based on the Z value of the start/end points of the trace. The larger the start/end Z range, the larger the variance of Hit.Z values. ...