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The snippet below shows some oddity I uncovered while trying to document a bit of code involving the Python node. The error constant is just here to provide a cluster input to the node (which is what the "Marshal to Named Tuples" is supposed to handle). The Always Copy node is here to go around the known problem that the comment arrow will snap to the middle of the wire it is attached to, NOT where the user connects it to the wire (and that of course will never change). The comments indicate that the first node input (which happens to be the return argument, but that has no bearing o the observed behavior) has been right-clicked and "Marshal to Named Tuples" was used. By contrast, the second node input has had no modification applied. The result (surprising to me) of the "Marshal to Named Tuples" option was that the wire broke, as if the node lost its ability to "read" the cluster element names. Obviously no such thing happens when making a copy of anything (you can still hover over the lower branch of the wire with a probe and the Help window will show all 3 cluster element names). I am erring on the side of calling this a bug, but it might just be some kind of arcane feature of the node which only its author is familiar with (and I don't really whether or not it changes in the future since I am dug in 2021 SP1). But here it is for every one to gawk at.