Have placed pumpkins, carved pumpkins, and jack o' lanterns on top of the four iron block T-shape and nothing will happen. I tried looking up if there was some change to how they were spawned in through building and could not find anything. I tried in survival first, and then in creative.
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Yes, it does. I tried searching for issues that match but couldn't find any. Apologies for making an issue that has already been created. Just to confirm, after I read MC-60792 I went to build try to build/spawn one with blocks other than grass around the base, and sure enough, it worked.
Does MC-60792 describe your issue?