Quite common, I would expect, because it's a machine cancel. The example probably just got gummed up in the machinery.
I also have examples of first day cancels that I tried to create with two different "first day of issue" postmarks on related topics by putting one stamp below the other and the machinery just overstruck the one cancel with the other one, so now I have garbage (or a conversation piece, depending on how you look at it.) I have another example where I sent a SASE to get "first day of issue" cancels on postal stationery and the clerk stamped the return envelope with my return postage with their "first day of issue" cancel on stamps which have nothing to do with the "first day of issue" postmark.
It's really quite amazing as to all of the oddities one could collect. It could be a collecting field in and of itself.
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