Plants cant grow under Farmland

In the old Version under 1.13 Plants are able to grow on Farmland while the block above is also Farmland because Farmland its Opacity.

But now it seems like with the 1.13 that change Plants are not longer able to grow under Farmland but still under othere Opacity blocks like Pistons or Glas.

So is the change wanted that Farmland is not longer more Opacity?

 

I also found some othere Bugreport discribe the Problem but never the change with the Farmland.

https://bugs.mojang.com/browse/MC-131834

https://bugs.mojang.com/browse/MC-132351  <-- This one is false