Is there a way that shadow caster can cast shadow on himself?

Hi! Like in title, I would like to make Shadow Caster 2D cast on himself. Specifically I need to cast shadow on area which I marked in red.

Which Unity version are you on?

I just testing things out, but it doesnt work in Unity 2021.3 and 2023.1

Than make the sprites seperate

What do you mean?

If you mean spliting Shadow Casters there is will be a lot of problems like:

bump