Bugs/concerning issues with Mail.app since 17.4

Starting iOS 17.4, currently on 17.4.1, using an iPhone 12, I have two very concerning issues with Mail.app.

The first issue: using my iCloud account, it shows a wrong reply-to address in the upper header in Mail.app. For some reason it shows a seemingly random e-mail address in the reply-to field and it appears to be an e-mail adress from which I received mail earlier. I haven’t seen this behavior prior to 17.4. It appears to be only cosmetic, when hitting Reply to all, the reply contains only the correct e-mail adress from which the mail originated,possibly - but I can’t verify that - unless another reply-to address was specified by the sender. Is anyone experiencing the same? I have, since the release of 17.4 reported it to Apple Feedback, and again after releasing 17.4.1 but the issue remain unsolved, actually Apple is in full denial. If you have this issue and urge you to do the report it, as it takes way to much effort to be taken serious by Apple.

The second issues is that the header with From: and To: are completely unrelated to the body of the mail. Apple Mail.app is litterally combining two mails, the one I selected and the body of a random mail in my inbox, which is incredible confusing and annoying. This just can't be true.

I've had contact with Apple Support on three different occassions and only one first line agent confirmed the issued and told me he had multipe people who daily reported the same issue. Not all users seem affected, but it seems to apply only to a part of the userbase. Yesterday I talked about an hour with an Apple senior representative who remotely took over my screen, confirmed what I told him and explained that the only thing left to do was to restore my iPhone from a pc or a Mac. What's up with that? That reminds of Windows 95/98, when we weren't able to fix things, just reinstall your PC (and everything on it).

I've tried forced closing, removing the mail account and re-adding it, but nothing seems to help. Strangely enough, my son also has an iPhone 12 in blue with the exact same version of iOS but he has no such issue. I saw someone posting on Reddit and there are multiple reports that people suffer from the same bug since 17.4 was released. I hate to say it, but the more of this unbelievable bugs I see, the less reason I have to stick with Apple after +30 years. There are a lot cheaper alternatives out there that pull the same crap and I'm not the customer to tell after decades of experience with Apple to be told by a teenage Apple representative that I should restore my phone with a PC or Mac, when so many reports are being made about the same issue. Apple, please get your sh*t together.