Do you have any source on that?

Specifically, it has the option to enable a "Diagnostic Data Viewer" that shows the data it sends (as JSON). I've just enabled that, so there is not much to see, but so far it has only transmitted version information of OS software components.

(Mini-) crash dumps can contain all kinds of information but that is kind of unavoidable. As a developer, I'm gratefull whenever I get a core/crash dump, but yes, it shouldn't be automatic.

Here's a full list of data it seems to send https://docs.microsoft.com/en-us/windows/privacy/windows-dia... (at full telemetry level)