Unreal Engine Issues
Unreal Engine Issues
Cook Non-Determinism in USplineComponent
UE - Editor - Workflow Systems - Feb 25, 20261. Non-Deterministic LastAuthority Serialization LastAuthority is assigned in USplineComponent::Serialize. Its value depends on the order in which the object and its archetype are serialized, leadi ...
Drag and drop does not work from a window created with PySide
UE - Editor - Workflow Systems - Feb 5, 2026The cursor position is no longer updated during drag and drop, so drag-over events cannot respond correctly. Commenting out the following code in WindowsCursor.cpp works as a workaround ( the behavi ...
Custom thumbnails don't get updated until the asset is saved
UE - Editor - Workflow Systems - Dec 4, 2025This is a regression, here's the repro in FN/Main (48954958) : [Link Removed] And now in UE5.7 (48496583) : [Link Removed] ...
Crash when saving after resetting Instanced array element via Property Matrix on placed actors
UE - Editor - Workflow Systems - Nov 21, 2025When an Actor Component contains an Instanced UObject array marked EditDefaultsOnly, adding a new element to the Blueprint defaults correctly updates the Blueprint and its own Property Matrix. Howev ...
Unshelving a file from Unreal locks unreal. Killing process leaves the file locked and can't be checked out
UE - Editor - Workflow Systems - Nov 17, 2025Unreal currently locks any assets that are loaded. Actions such as "revert" from within the editor handle this properly by unloading the asset but unshelving from within the editor does not respect ...
Ensure triggered inside Range Struct Customization when Property Node is no longer valid (e.g. when editing FFloatRange while FRuntimeFloatCurve editor is visible) [Ref. UE-341339]
UE - Editor - Workflow Systems - Nov 12, 2025[Link Removed] was fixed by CL 46990575, successfully avoiding an ensure condition inside FIntervalStructCustomization::SetValue() when its Property Node is no longer valid. However, the same proble ...
TOptional value changes in parent BP don't propagate to loaded child BPs
UE - Editor - Workflow Systems - Oct 27, 2025Context TOptional<T> is a wrapping struct around a type, that lets the property have an set and unset state, in addition to the property's value when set. It is editor exposed: designers can open b ...
Typo in "BaseEditorSettings.ini": under section [/Script/UnrealEd.ContentBrowserSettings], key "DisplayPluginFolder" (singular) should read "DisplayPluginFolders" (plural).
UE - Editor - Workflow Systems - Oct 11, 2025File "<ENGINE_PATH>/Engine/Config/BaseEditorSettings.ini" contains the following setting: [/Script/UnrealEd.ContentBrowserSettings] ; Whether to display the game project plugins in the Content Brow ...
Revision Control > View Changes: Request for direct navigation from the Content Browser assets right-click menus to View Changes
UE - Editor - Workflow Systems - Sep 22, 2025Right-clicking any object (Assets or ExternalActors) in ViewChanges allows selection. Conversely, using Source Control > View Changes from an Actor's right-click menu in the Outliner navigates to Vi ...
Revision Control > View Changes: Request to add functionality to copy paths and short package names directly from ViewChanges
UE - Editor - Workflow Systems - Sep 22, 2025Hovering over items in the ViewChanges list shows resource paths and short package names, but these cannot be copied. Users must instead select the Actor in the Outliner to copy this information. Pl ...