Modern Comments and Requiring Check Out

So, I'm 95% sure I have the answer, but hoping someone can confirm.

I have a document library where Require Check Out is turned on. Users have complained that the @Mention functionality isn't working. 

I found the following article: Mentions in SharePoint files don’t send email notifications to participant - SharePoint | Microsoft Learn

I understand that comments will not send notifications whilst checked out. To confirm, is it also true that the comments will not trigger notifications on check-in?