I need help with shadow

Thats weird Xelenn. I added swatches with no edits and got the same thing. I have no answer for you. I looked in the warehouse at the lods to see if the shader was wrong but there is no shadow lod. All I can suggest is try it with another plant and see if you get the same result.

Xelenn, it looks like this plant, like many of EA's plants, is an oddball. The shadow LODs, unlike those in "normal" object .packages, are using an instanced shader instead of the shadow shader. Since Studio is looking at the shader to determine how to handle any given LOD when you add a swatch, it is handling this as if it were a main mesh instead of a shadow mesh. When you add a swatch, Studio is, thus, adding variantIDs to the shadow LODs which, for whatever reason, causes the game to no longer recognize them as shadow casters.

Studio can be updated to deal with this flower and others like it. In the meantime, if you don't want to go to the trouble of cloning some other thing and transferring the mesh from this clone to that one, you can use the sunflower, export both shadow LODs from the Warehouse (use the export feature on the right side, not the batch export feature), go back to the Studio tab and add your swatches, and when you're done adding swatches, go back to the Warehouse and import the shadow LODs back in. I tested this myself and in the game my multi-swatch sunflower had a shadow showing when placed outside in the sun.