Why is the rubric not visible to learners when an assignment is linked in the Content area?

I have attached a rubric to an Assignment Submission item. If I link learners to the Assignment tool to have them access the Assignment, prior to submission they see the rubric beneath the assignment instructions (at this point it has no feedback). This is the expected experience.
If I link learners to the same Assignment through the Content area (i.e., within the table of contents area, I use the "Attach Existing" button to attach the Assignment Submission item) then they do not see the rubric. Prior to submission, the see the instructions but not the rubric. I have uploaded a screenshot showing the difference.
This issue exists in both the old content experience and the new one. Why is the learner view different if the Assignment item is the same?
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