This was because `stroke_id` was not using `vertex_start`. But since `vertex_start` is not 1 based like it used to be, we need to add 1 to it to avoid a fragment depth of `0.0` which would be equal to the background and not render.
This was because `stroke_id` was not using `vertex_start`. But since `vertex_start` is not 1 based like it used to be, we need to add 1 to it to avoid a fragment depth of `0.0` which would be equal to the background and not render.