I've hit the issue described in '11:
"Enable comments for post with comments meta box removed" and I'd like to ask for your help to adapt the mentioned there code to the current wordpress version.
I have a custom post type that must have comments enabled and contributors must not be able to disable comments.
I've enabled comments in Settings->Discussion and removed the
commentstatusdiv meta box with
remove_meta_box(). After that I've figured out that comments is unset when the meta box is disabled.
I am looking for the way to enforce the comments now.