Cloth Constraints changed after upgrading from Unity 2018 to 2021

[Emirk]

We have a project that was upgraded from Unity 2018 to 2021 LTS. I noticed a weird thing: Some of our prefabs have cloth components, and the Cloth Constraints change just by upgrading Unity. Here’s two pictures to better explain what I mean.

Now to fix this, I could manually go over 100+ prefabs and re-paint everything, except that doesn’t work either because I can’t paint new constraints. Seems there are several threads on that specific bug about not being able to paint cloth constraints.

Anyone had this issue? Is there something I can do apart from trying to repaint all cloth constraints?

[Emirk]

Actually here’s the prefab if anyone wants to have a look. Texture references will be missing but you should be able to see the cloth constraints.

8975383–1234150–placard_26.prefab.zip (25.8 KB)

[Emirk]

I found this thread that among other things discussed the same issue: Major cloth issues in v2019.2.0f1

Some slight progress, I learned that by setting the Optimize Mesh setting to Vertex Order, the cloth constraints are more accurate, but still not identical. Looks like a repaint is necessary anyway.