Project details - History / Email list - sent emails showing as "In Draft"

I just noticed today under a given “Project” → “History” that there were errors in the listed emails.

I call your attention to the email that has the “Date Modified” highlighted.
The In Draft marked emails is the same email as the Sent email.

I understand I let the email composer open for half an hour while taking a phone call, what I don’t understand is why the same draft is recorded this way, and why when the email was Sent the drafts didn’t disappear.

And finally, how to get rid of them?

Just bumping the topic …

Should I open a GitHub issue?
Thank you.