Unreal Engine Issues
Unreal Engine Issues
Cook non-determinism when serializing UObject pointers pointing to garbage
UE - Core - Systems - Aug 25, 2025There's a cook determinism issue in the way UObject unversioned serialization handles UObject pointers pointing to garbage. Depending on GC timing, it can either be skipped (as a property matching C ...
GAS: GameplayAttribute picker incorrectly also lists AttributeSets' non-attribute properties
UE - Gameplay - Gameplay Ability System - Aug 21, 2025Context: FGameplayAttribute's details customization lets designers pick any attribute property from any UAttributeSet class. Problem: This currently displays all properties of UAttributeSet class ...
Inclusive Nativized Blueprints slower than Non Nativized Blueprints in packaged project
UE - Gameplay - Jul 1, 2019When nativizing blueprints the packaged build of the project runs slower than a non-nativized version of the packaged project. Found in 4.22 CL#7053642 Reproduced in 4.21 CL#4753647, 4.24Main CL#7 ...
Crash accessing a non-empty TSet or TMap local variable in a blueprint function
UE - Gameplay - Blueprint - Mar 6, 2017Getting a crash when trying to access a non-empty TSet or TMap local variable in a blueprint function. This is only occurring with local variables. The issue also does not occur if the TSet or TMap ...
zero-volume being cutoff and not restarted when non-zero
Licensee reported issue with recent changes to sorting that include volume-weighting. Previously, the sort was just due to priority (which was usually 1.0 and thus the sort was nearly random) and ha ...
Cannot add a non-static custom thunk to a code class
UE - Foundation - Cpp Tools - UnrealHeaderTool - May 7, 2018In 4.19, it is no longer possible to create a non-static custom thunk in a class. This was possible in 4.18.3. REGRESSION: Yes. ...
Wild card pins do not update when other pins on the same node have been used
UE - Gameplay - Blueprint - May 5, 2017Wild card pins do not update when other pins on the same node have been used. If the other pin on the inputs node is connected, the other wildcard pin(s) will no longer update back to wildcards if ...
Crash when converting non-WP maps containing landscape with OnlyMergeSubLevels enabled
UE - World Creation - Worldbuilding Tools - World Partition - Jul 21, 2023When trying to convert a non-WP map with OnlyMergeSubLevels enabled crash after a while ...
Light Complexity view mode crashes if there are hair cards in the scene
UE - Graphics Features - Jul 24, 2024The Editor will crash if Groom Hair Cards are viewed with the Light Complexity View Mode. ...
Flickering windows with four player PIE on Laptop Geforce cards
UE - Graphics Features - Oct 1, 2015Flickering windows with four player PIE on Laptop (mobile) Geforce cards. See attached video, or video link from the answerhub thread. It happens repeatedly and very frequently. ...