Corrupted/empty messages

I am using em client version 9.2.2157 on windows 11 in CZ localization and I have my gmail account connected. I consistently encounter this issue where where some of my sent emails are completely blank. As far as I know it happened only when I was replying to emails, not when I was sending a new one. I write quite complex emails and it takes me a lot of time to rewrite them, because I can’t recover the text I wrote, can anybody please help me?

Thanks a lot.

The email is completely empty in my gmail as well and recipient sees the message as blank as well.