Intermittent UnexpectedCommandStatusError from mailbox.fetch()

When looping over fetch, every few or dozens of passes will result in error.

with MailBox('outlook.office365.com').login('xxx', 'xxx') as mailbox:
	for message in mailbox.fetch():
		# do something

quickly or eventually results in…

UnexpectedCommandStatusError(imap_tools.utils.UnexpectedCommandStatusError: Response status for command “box.fetch” == “NO”, “OK” expected, data: [b’The specified message set is invalid.']

• Python 3,8.1
• imap-tools==0.13.1

I have added a while loop with catch to try again on error, but I want to make sure there isn’t something else going on.

Are there any known issues with certain services or reasons this might be happening?

[ikvk]

I will add more examples for this case

[ikvk]

Probably Yes. I always collect the necessary changes and perform actions like move after fetch loop. This is not a bug of lib. This is IMAP )