Unreal Engine Issues

ULevelSequence trying to duplicate a REINST_ class when creating new custom binding in ConvertOldSpawnables()

The assert that we're hitting is:Cannot replace existing object of a different class.  New Object: /Engine/Transient.REINST_BPC_NPC_VFX_C_230 /Game/Maps/[REDACTED]/Levels/[REDACTED]/LevelSequence/ ...

TInstancedStruct used in native actor class loses reference to Instanced UObject after BP recompilation

When a TInstancedStruct contains a UObject marked with EditInlineNew and DefaultToInstanced, the reference is lost after compiling the Blueprint but only when the struct is part of a native Actor cl ...

Blueprint compiler doesn't always initialize struct consts correctly

Blueprints 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 ...

Ensure failing when compiling Macro Library blueprints

Editor crash after reverting a Blueprint asset in source control

Added context from dev support ticket:The crash occurs because FDelegateProperty::Serialize accesses a dangling SignatureFunction pointer. Given that its derefencing dangling pointers the specifi ...

No warnings or errors if a UEnum has Bitflags metadata, but no Flags flag.

The problem here isn't obvious: the native enum, EAnotherEnum, is missing the Flags flag for the UEnum. As a result, K2Node_GetEnumeratorNameAsString returns the max enum when it gets a combined fla ...

Bitmask ints can't be converted to strings

While we do have an auto cast function that handles an int to string conversion, bitmask ints use a "bitmask" subcategory which thwarts are ability to find the cast function. ...

K2Node_GetEnumeratorName doesn't support bitmasks

This is almost identical to [Link Removed]. The difference is that we need a variant of UEnum::GetNameByValue that supports bitmasks. We'll likely have to run this by Core. ...

Blueprint function-local variable properties don't copy metadata from the source FBPVariableDescription

FKismetCompilerContext::CreateUserDefinedLocalVariableForFunction() does not copy the metadata from the source FBPVariableDescription entry. Class variables work because there is code for that in FK ...

Selecting an asset directly in a blueprint method parameter asset selector fails when the parameter type is an interface.

Ensure message: Ensure condition failed: false [KismetCompilerVMBackend.cpp][Line: 1076] It is not possible to express this interface property as a literal value! (InterfaceProperty /Script/BugRepr ...