https://www.ghacks.net/2022/03/22/android-messages-and-dialer-apps-allegedly-sent-data-to-google-without-consent/ Not necessarily something new or unexpected, but a confirmation that this is actually happening.
simple dialler for phone simple contacts & simple calendar to a self hosted nextcloud instance signal for sms/secure chat
If this chart is still accurate (it is one of the first hits in a Google search) then I wouldn't really worry about what Google is doing here: How long do wireless carriers keep your data? (nbcnews.com)
I live somewhere else geographically. Mobile carriers also retain data here. For me it is different when data is duplicated and send to the other side of the globe.