Unreal Engine Issues
Unreal Engine Issues
Client and server can both get stuck waiting for packet sequence history flush
UE - Framework - Networking - Sep 4, 2025The issue occurs when both instances have a significant difference between their last sent and last ack'd sequence number, as they will begin waiting for the sequence history to be flushed for a pac ...
Out-of-Bounds Access During Partial Updates of ISMC Per-Instance Custom Data
UE - Rendering - Features - Jan 6, 2026When using instance custom data values, removing an instance and changing the number of custom data floats in sequence can cause an array-out-of-bounds crash. The underlying arrays are not resized ...
Metal crash on iOS with Loading Screens
UE - Platform - Mobile - Sep 13, 2016When "Support Forward Rendering with Metal is set, packaged projects will crash on iOS device at splash screen This was tested on an iPhone 5S, asset #5065 ...
Blueprint compiler doesn't always initialize struct consts correctly
UE - Framework - Blueprint Compiler - May 1, 2025Blueprints currently don't support unsigned 64 bit ints, but they do support signed 64 bits. If a Blueprint uses a native struct variable that contains a uint64 property, it incorrectly assigns that ...
When using StringToBytes() it returns an incorrect value
UE - Foundation - Core - Jan 4, 2018When using the StringToBytes() function it returns one less byte due to the -1 at the end of the return. The function takes a string and converts it to bytes but it always returns one less byte than ...
Stat unit and the console render incorrectly on OSVR
UE - Platform - XR - May 6, 2016Found on: //UE4/Dev-VR CL-2967563 Both the console and stat unit numbers render incorrectly, their positions in each eye do not line up correctly, causing you to 'see double'. ...
Entering nine or more digits into a numerical field will change the value upon confirmation
Tools - Sep 9, 2016If a value with nine or more digits is entered into a numerical field the number the last few digits will be converted to another number upon accepting input. This happens in blueprints as well as ...
No deprecation message with component bound event nodes
UE - Framework - Blueprint Editor - Aug 21, 2023It appears that only custom event nodes support a deprecation message. In fact, we need all nodes that use delegates in some fashion to support a custom deprecation message. Both UK2Node_ActorBoundE ...
PCGComponent in PCGVolume is called "PCG Component", breaking t3d serialization
UE - Graphics Tools - PCG - Components - May 21, 2024From PCGVolume.cpp: PCGComponent = ObjectInitializer.CreateDefaultSubobject<UPCGComponent>(this, TEXT("PCG Component")); The Component name with a space does not support a round trip through FSof ...
FNetGUIDCache warning when attaching non-replicated component to a replicated scene component
UE - Framework - Networking - Jul 18, 2024When the replicated scene component's AttachChildren array is replicated, the package map attempts to serialize the non-replicated component, causing the warning that the object is not supported. ...