ah, i believe you are referring to the webrtc data channel. it leaks local IPs, but the severity depends on several factors, including whether you're running VPN and what you're using the VPN for, or just running behind a regular local network.

if you're running behind a regular local network then I wouldn't consider the local IP leakage as a "privacy hazard". local IPs are compromised already. everywhere. they are easy to guess. they are easy to obtain in native apps. etc.

there are issues when it comes to places where VPN access is crucial/vital. thankfully, very few VPN providers leak your IP nowadays, and with drafts such as what the poster above mentioned (https://datatracker.ietf.org/doc/draft-ietf-rtcweb-mdns-ice-...) this problem will be history soon enough.