Freeform lights broken in 2021.3.6?

We're trying to upgrade from 2020.3.14 to 2021.3.6 but the free form lights seems broken, or is being used in a different way that i don't understand.

We want to make a halo of light, that should enlighten a sprite in the background. This is what it looks like in 2020.3.14:


And this is in Unity 2021.3.6:


The light shape is like a donut with a slice in part end to have it join.
The light renders totally weird, with lines cross, and you can't see the texture of the background sprite.

It seems to happen when the shape is convex (?) or has points overlapping in weird ways, but also when trying to make a C shape.

Here's a clip of me fiddling with it:

 

Thanks! I’ll check that out about the texture. I found that the issue with the light freaking out was when the shape of the freeform light was touching itself including the falloff. That didn’t happen in 2020.

So we ended up doing two half donuts instead and it works, it’s just a little tricky to get it to join smoothly but it works.

Thanks again for getting back!