I’ve seen at least one official notice here that make/break struct nodes will display structure member names incorrectly when a project is reopened. For the sake of completeness here is a demonstration of the bug in the construction tab of my project - impacting every pin of my custom structs on both the break and make nodes.
Another example of this pin display problem but on Array Get (expanded) pictured below. It will also appear if these three nodes are collapsed into a macro on the macro output node.