Old melon and pumpkin farm broken. Only top layer of plants grow crop. Crops planted above a lower half slab do not grow. Bonemealing matures the stem, but does not produce crop. Tested covered with opaque and transparent blocks, same results.
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To clarify, it used to be the case (up until 1.13) that pumpkin and melon stems would still produce fruit even if they had a farmland block above them (which allowed players to stack layers of them on top of each other), but now they don't, hence why the top layer is the only one still working for people like me and Wayne.
Clearly in one of the scenarios attached there are no blocks above the plants. They are above a lower half slab. Java edition 1.13 full release, not pre-release, realms.