The point is is that it should never, under no circumstances monitor and eavesdrop private chats. It's an unacceptable breach of privacy.
Also, please explain what "specific circumstances" you are referring to. The current proposal doesn't limit the scanning of messages in any way whatsoever.
Here's the text. There are no limits on which messages should be scanned anywhere in this text. Even worse: to address false positives, point 28 specifies that each provider should have human oversight to check if what the system finds is indeed CSAM/grooming. So it's not only the authorities reading your messages, but Meta/Google/etc... as well.
You might be referring to when the EU can issue a detection order. This is not what is meant with the continued scanning of messages, which providers are always required to do, as outlined by the text. So either you are confused, or you're a liar.
Cite directly from the text where it imposes limits on the automated scanning of messages. I'll wait.
All messages detected by whatever algorithm/AI the provider implemented are sent to the authorities. The proposal specifically says that even if there is some doubt, the messages should be sent. Family photo or CSAM? Send it. Is it a raunchy text to a partner or might one of them be underage? Not 100% sure? Send it. The proposal is very explicit in this.
Providers are additionally required to review a subset of the messages sent over, for tweaking w.r.t. false positives. They do not do a manual review as an additional check before the messages are sent to the authorities.
If I send a letter to someone, the law forbids anyone from opening the letter if they're not the intended recipient. E2E encryption ensures the same for digital communication. It's why I know that Zuckerberg can't read my messages, and neither can the people from Signal (metadata analysis is a different thing of course). But with this chat control proposal, suddenly they, as well as the authorities, would be able to read a part of the messages. This is why it's an unacceptable breach of privacy.
Thankfully this nonsensical proposal didn't get a majority.
Ahh, that is indeed a critical detail on the implementation not quite clear right away. To be honest I don't trust the end-to-end encryption most of these services offer. If I want perfect privacy, I'm sticking to self hosting stuff