Although DefaultInstanceData of Level Sequence can be edited by BP, bOverrideInstanceData can not be edited by BP. Therefore, to reflect the edited result of DefaultInstanceData by BP, it is necessary to enable bOverrideInstanceData on the editor or set bOverrideInstanceData to true from C ++. This will cause confusion.
Changing UPROPERTY of bOverrideInstanceData from BlueprintReadOnly to BlueprintReadWrite can't solve this issue. Because bOverrideInstanceData is used in LevelSequenceActor::InitializePlayer().
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-72062 in the post.