I need help setting autotile for dirt tiles from sprout lands

[astral basalt]

Hey guys, I don't know if I am at the correct place to ask this question, if not please correct me. I am trying to learn about autotiles while creating a test game using the asset pack Sprout Lands (https://cupnooble.itch.io/sprout-lands-asset-pack)

But, in the free pack, it comes with a dirt tileset that is a lot smaller than the grass tileset, I tried to enlarge it using libresprite, but when I put it to the test, it bugs a lot.

I would like some help to what I might be doing wrong and how to use this tileset correctly.

[winged pasture]

Could it be possible that the dirt tiles are not meant to be resized?

Could they be an optional additional layer over base grass tiles, applied as needed?

If so maybe what you do is to paint the base grassy areas first then create another layer, for the parts where you want dirt patches. The difference in size should allow for dirt, but with a "border" of grass around it