I'm trying to use data generation to create blockstates and block models. I'm a little stuck on generating my block's item model. I'm trying to make it inherit from the block model, but the data generator seems to be assuming it should instead inherit from an item model. This essentially results in the item model inheriting from itself instead of from the corresponding block model.

Here's my BlockStateProvider and the resulting item model. What am I missing?

You don't need to use itemModels there, you need to use a ModelFile of the Block.
You can use a ExistingModelFile or a UncheckedModelFile depends on whether the Block model has already been generated or not.
You can get the location for the ModelFile from #blockTexture.

Thank you, that worked!. It took me a minute to figure out how to use an ExistingModelFile. For future readers, you can get one through models().getExistingFile and passing in the resource location of the block model.

You simply can create a new ExistingModelFile or UncheckedModelFile.