The problem still persists on iOS 14.7 Beta #5 (July 8 2021).
My company's Oracle Approval email workflows are broken.
Executives and managers approve time cards, purchases etc via iOS Mail.app. The original message is HTML. When the "Approve/Deny" button is tapped, the reply message body is no longer HTML - it is formatted as plain text, and thus it shows the raw tags - which completely breaks Oracle.
Our purchasing, Accounting, and Executive teams are not happy campers...
This issue started for us in iOS 14.6 and continues in 14.7 thus far.
We are considering replacing Apple Mail with MS Outlook for iOS managed devices if this continues.
Does anyone have an open support case with Apple that I can cross-reference?