If you mean half blocks, it doesn’t work because only full block and slope blocks allow planting, same way like with grass on live.
Some blocks will burn when lava touches, I don’t mean adjacent like vertical flow, I mean when flow would continue so that it would populate block. I haven’t actually tested lava over crops, but lava destroys grass so I expect it have same effect to planted items.
I am actually just jumping to testing so I can drop lava to few farming places and give screenshot samples.
Here is also one video where I test some burning with lava.
It not be clear from video but I put some goo hanging on slope chiseled sponge and berry vines to foliage those were gone when lava did come same block.
Video is missing fuel plants (Combustion Fraction and Kindling Mass) but those will also burn.
Lava next to soil don’t burn, but there is no reason right now to have lava next to soil except for visual purposes.
If you are thinking of goo, growth and sponge blocks will burn. So stuff that is planted to those will burn.
If you plant goo to rock and have chisel rock so that you can place or flow lava to it, goo below will burn.