can confirm this definitely happens with vanilla GrapheneOS - just have flashed and no installed apps yet.
More specifically bundled Vanadium Browser attempts following connections:
translate.googleapis.com, when going into Vanadium Settings -> Languages
update.googleapis.com, when going into Vanadium Settings -> Privacy and Security (ironically)
(via Pi-hole logs, this is what I could identify for now)
You may need to restart the Browser app and scroll a bit inside menu entry.
At least, these domains are not listed in What kind of connections do the OS and bundled apps make by default?.