When one mail is deleted, another is also deleted

Sometimes eM client simply moves a mail from the inbox to the trash. For example, I have two similar mails and when I delete one, the other is also deleted! In addition, the preview of the first mail shows the content of the second mail - until I mark the second one as “read”!

I can reproduce it and have a little video.

iOS 17.5.1, eM Client 10.0.2643