Almost everything clones correctly when cloning an environment, except for the Builder.
I use Dockerfiles, but when I cloned the environment, I was getting failures that I identified as being caused by the fact that when I cloned the environment, it set the builder to Railpack on one and Nixpacks on the other.
I'll set it to Dockerfile, and it'll unset itself and go back to Railpack or Nixpacks, as it wishes.
For clarity, this is my railway.toml:
[build]
builder = "dockerfile"
dockerfilePath = "Dockerfile"