Unreal Engine Issues

HTTP GET requests are much slower than a Python script by a factor of 15-20x

Based on user report, a HTTP Get request from UE4 is 15-20x slower than if using a Python Get request to get the same file. ...

LLDB 2-byte char data formatter script fails in Android Studio

Android Studio does not properly parse the UE4DataFormatters_2ByteChars.py distributed in 4.20. ...

Replicated component leak on clients if RPC forces construction and server destroys it in the same frame

RPCs called on actors force a channel to be opened and the actor to be replicated at least once. If the RPC is called on a new replicated component while the actor channel is already open, but the ...

Mac - Xcode fails to build C++ project with a Shell Script Invocation Error

This does not occur in 4.25.4 Binary and is a regression. ...

Crash on PIE exit after dynamically enabling and disabling tick functions through the Level Script blueprint.

User reports hitting an assertion due to invalid FTickTaskManager state when game is attempting to unregister a tick function that was previously disabled dynamically. Failed assertion is in FTickT ...

Classes in TargetDenyList modules are still referenced from Components on BlueprintGeneratedClasses and cause runtime warnings

Other than the presence of the error and the performance cost of looking for a package on disk that does not exist, there are no behavioral problems. When running with legacy (non-iostore) pakfiles ...

Setting the Take Recorder Panel's mode several times through scripting can cause the panel to become invalid

The bug can be worked around by checking the Panel's mode before setting it. ...

When the async loading thread is enabled the game sometimes crashes trying to construct a Blueprint Class GC token stream

Backwards-compatibility broken for the CDOs of Python-generated Unreal Types because of missing redirectors

Previously, all Unreal Types generated by python scripts would be created inside package "/Engine/PythonTypes". This was changed by [CL 32478991 in ue5-main branch], which meant to "remove the restr ...

ENiagaraCoordinateSpace is not exposed to Python, meaning the FXConverterUtilitiesLibrary create_script_input_enum function does not work when setting that parameter.

The user was having issues with setting the correct ENiagaraCoordinateSpace enum in their python script. This enum currently exists in the engine as both a user-defined enum (which is deprecated), a ...