Read receipt always requested on emailed documents with Send Read Receipt unchecked

A read receipt is always requested when I email a document whether or not the Send Read Receipt checkbox is checked. Is this a bug or am I missing some setting?

Recently upgraded from v12 to v14.

ERPNext: v14.2.3 (version-14)

Frappe Framework: v14.10.0 (version-14)

Hey, did you get any idea how we see read receipt tracking when we open the email?