Support needs to be able to make and update news posts, since part of their job is communicating with users! In fact, they've written a post about something in this release...
The support role should be added to this line.
An especially lovely person would also update the admin post controller specs to test that all the roles that should be able to create and edit admin posts can actually do so. Right now it only tests the communications role.
Log in as an admin with the support role
You should be able to post, edit, and delete news posts
Works from my account on Test
Set my admin account’s roles to “support“. I can post, edit, and delete a news post. Looks good.