You have a strong hand with 4 Spades and hoped to get it for 1 Spade X or to fetch some more informations.
You surely do not have just 3 Spades, or you forgot your support double AND took 3 NT to a 4/3 fit.
I really think that any other second bid with your hand (instead of pass) had described the hand better, but otoh I agree with you that pd should have found it. At least in the post mortem.

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