Doubt about shadows and posible solutions.

[Enloch]

I'm trying to make a home façade and I'm hitting a problem regarding the shadows when a object hits himself with them.
The shadows get tessellated (for a lack of a better word from my part) and this is the first time I've encountered this with R3F and Drei.
I tested multiple stuff after searching on the internet, from env maps, to multiple small lights, to reducing models, etc... To no avail.
Images for reference in different meshes:
A

B

Test :
https://codesandbox.io/s/test-walls-hphzdt?file=/src/App.js:1737-1771

Any help would be appreciated.

[Enloch]

Resolved it making the shadow bias far more tight.