Apple mail / gmail 2 emails got combined

I have Gmail coming into my Mac Mail app via IMAP(I think)

I recently deleted an email into the trash of Mac mail & then realised I needed it again as it had a code I needed. I dragged it back into the inbox of my account (in Mail) and when I opened it, the body of the email was a completely different email (that I had also deleted). It had a different sender a different subject etc - yet the header in the inbox is the correct email, as is the sender.

Is there any way I can make this go back to being the email it should be? I've looked at Gmail in my browser, and it is still the wrong message. I tried forwarding it as an attachment - still the same problem.

I thought the company could simply resend me the code but they can't do that.

Is there any way I can get this email back?