The #original_sender tag is not detected when email encoding is base64

The #original_sender tag is not detected when email encoding is base64

Hello,

I believe the #original_sender tag is not detected when emails "content-transfer-encoding" is base64.
I've been sending mails through SQL and when it's received by Ticketing platform, the original message is detected to be encoded in base64 and #original_sender tag is being ignored.

This is how I send mails, when "body_format" is set to "HTML" it also fails.
  1. EXEC msdb.dbo.sp_send_dbmail  
  2. @profile_name = 'ProfileName',  
  3. @recipients = 'user1@domain.com',
  4. @subject = 'TEST',
  5. @body = '#original_sender {user2@domain.com}',
  6. @body_format = 'TEXT';
Thank you!