Adding map elements to a structure does not retain the information after saving and closing the project. This only appears to happen after you add a considerable number of Map containers inside a structure like 4 or more. With few it works fine.
Result: Opening the structure again will show the member that uses Map container with broken values like "PLACEHOLDER_CLASS..."
Expected: The Struct to save properly after saving and closing the project.
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-71650 in the post.