Farm blocks are too large. They displace a water block if the block is underneath it. Resulting in the farm block not getting watered.
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There must be a water block at the same level or 1 block above the farmland for it to be hydrated. See here

@Jason Wilkosz Can you clarify what the bug is here?

are you going to respond to my last two post with more information?

@unknown, what are you talking about? Looking at your Activity Stream, you only did 2 things: created this ticket and added this comment, so we don't know what we should respond to.
And actually we want your response on the last comment by @unknown

When you place a dirt block, then hit it with a hoe, to make it a farm block, the top of the block drops down a bit. It seems that this displace part of the block, instead of going away, becomes an invisible part of the bottom of the farm block. Making the block the same size, but stick out the bottom a bit. This bit that sticks out the bottom displaces a bit of the water underneath it making the water underneath the farm block not register, and creates a small air zone(as you can see from the two screen shots I sent).
This has not always been the case, as I've use this method to water farm blocks for the last six years. So I'm assuming its a bug.

It seems that Atlassian JIRA is only sending emails from here, but not sending the responses to here.
I sent that response with more detail 5 days ago.

That's not a bug.
It always does that...

No it hasn't.
Let me say again,
This has not always been the case, as I've use this method to water farm blocks for the last six years. So I'm assuming its a bug.

You can see in both of the screen shots where the indentation of the farm block is affecting the water block underneath it.

Stop marking this "Resolved"
It would be nice if you were more interested in fixing issue than closing tickets so it looks like you're doing your jobs.

Duplicate of MC-91224; this is intended behaviour. Water does not extend to the top of the block it's in, no matter what block is above.

Water is always at that level, farmland above it or not. Has been that way forever.
Farmland doesn't "stick down" beyond its own block. This isn't possible. The block is simply 15/16 of a block tall.
Farmland requires water on its own level, or one higher, to be hydrated. If you've been experiencing hydrated farmland when water is below it, that's been a lucky coincidence so far, and you've actually had water above it or to its side which was hydrating it, in your setups this whole time.