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If anyone is interested in finding incorrectly connected Constructors automatically, here is a VI that will do that for you: It's not very fast, but it does its job. The result is a list of VIs with the total number of Constructor Nodes found and the number of Constructor Nodes where the first terminal ("new reference") isn't connected. This is an indirect solution because the offending terminal officially doesn't exist (not accessible via scripting).

Thanks for reporting @_Mike_ Turns out the terminal adjusts to the object type (object or enum). In your case the Constructor is for an enum type, so it actually returns an enum instead of a reference. Here is another example: This is the corresponding definition according to Visual Studio: Very interesting behavior indeed.

I can also report similar behavior. What is more - by complete random choice of constructor - I have got a I32 output rather than reference.

Two years later...I found another way to handle this which is to put a clear functions command in a MATLAB Script Node at the start of the VI. This will force a recompile of the externally-edited .m file.