Wall Paint Peel plane meshes will not cast any shadows

Hi everyone, I have an issue related to lighting in planar objects. I modeled a wall that has a kinda paper wall texture and I want to make an effect where some pieces of the wall are torn apart. So these pieces of the wall are simple tessellated planes, stuck to the wall and I vertex painted some transparency to make that torn apart effect I’m looking for.

As long as I know, a two-sided material would be enough to make the planes cast shadows behind them against the wall, also tried enabling Two-sided Lighting in the mesh settings… But still, I don’t get it to cast any shadows once the light is baked…

It is a bit desperate, I spent quite a lot of time investigating this issue and I couldn’t really find a proper solution in the community, so please, I would be very grateful if anyone could lend me a hand.

Thank you very much!