As per this article, I am reporting this parity request here
I have checked the beta changelogs to try to make sure this isn't an already implemented feature in a future version, but I apologize if I missed it.
In the Java 1.13 pre-releases, Pumpkins and their crafted variants can be placed like normal blocks, removing the requirement that they be placed on a block. ( https://youtu.be/9DY8LU3lghc?t=354 )
This is a feature I was excited to hear about, but I cannot reproduce this in my Bedrock game, despite the release of the Update Aquatic for Bedrock.