I recently discovered that subtasks created by rules do not inherit values for private custom fields or public custom fields with Guest set to “no access.”
In our situation, some of those subtasks are multi-homed into other projects for further action by other teams or for reference by a wider group. I was hoping to use private custom fields to help tailor the information visible to members of the reference project who need to know and simplifying the view for members who only need higher level data.