First: On Java Edition, full block faces block the flow from the water source, but not on Bedrock Edition.
Second: On the Java Edition, the door creates an air pocket in the water, while on the Bedrock Edition it doesn't.
If the second can still be called a minor difference between the editions, although I don’t agree with this (the developers themselves said that you can use doors to explore the aquifers added in 1.17, but this won’t work on Bedrock), then the second is a clear flaw, which is already has been in need of repair for many years.
Please consider this bug properly, and not flag it as a duplicate of something, or as something that "works as intended". I and the rest of the community just want the Bedrock Edition to be treated with the same trepidation as the Java Edition, and such seemingly minor flaws greatly affect the final impression of the game in a negative direction.
Also please reconsider MCPE-171003