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.