Are Study Permit and Work Permit mailed to applicants separately?

[ngmq]

Today my application for study permit extension and initial co-op work permit has been approved (screenshot 1:

https://imgur.com/4SlP1iC

). The study permit has document number F3... and the work permit has document number U5... However, in the "In Canada Approval Letter", it is indicated that only the work permit (number U5...) is being mailed to me (screenshot 2:

https://imgur.com/Nvqm009

). Is this just a glitch in the Approval Letter or did they really "forget" to mail the study permit? Anyone else applied for both study permit and co-op work permit but only got one document and had to request the other?