Attachments missing in Mail app emails

Hi,

I have come across an issue where attachments aren't appearing in the Mail app. This is with a Gmail account. For example, the sender of this email sent it through Apple Mail with 3 unique attachments. In the Mail app, I see one attachment with it showing as three duplicates of the same file in the body.

However, when I view the email through Gmail's website, I can see all 3 unique attachments

This issue seems to be isolated to using schedule send in the Mail app. Both, I and the sender, are seeing this behavior.

Sender:

Mail Version 16.0 (3731.300.101.1.3)

Receiver:

Mail Version 16.0 (3731.600.7)