I have a similar issue on my pixel 7 where I don't get any internet or even phone calls for that matter, sms is flaky at best. I need to turn off the mobile network, change to 3g then get out of the settings, go back in change to 5g, turn on mobile internet and I get it for a bit until it either goes to 3g or h and no more internet. 4g is impossible to get. It is a hellscape at the moment, happened with an update say a week ago.