Strange that BT works and that WiFi doesn’t as they share the same antenna, usually also the same chip on the systemboard.
Did you try both WiFi signal options 2.4GHz and 5GHz to see if either network signal frequencies were being detected? Not sure with your model but check in the WiFi settings maybe under Advanced to see if both options are available to be enabled/disabled etc .
Here’s a link that shows how to test the different hardware functions in the phone. I realize that they are for a Pixel 3 XL hopefully they are the same for your model.
In the codes there is a Wireless LAN (WiFi) test code that may be worth a try.
If the test is OK then maybe it is an antenna problem as the test would indicate that the WLAN chip can communicate OK with the OS.
Here’s the iFixit Google Pixel 3 Hauptplatine austauschen guide.
It is useful because it shows how to open the phone so that the antennae can be checked to see if they’re loose etc
Steps., 24, 25 & 26 show the WiFi/BT antenna cables and their connections.
Step 34 mentions the antenna bracket. So perhaps the 1st image at Step.34 is the GSM antenna because in most phones the GSM antenna is not a signal cable like what is used for WiFi and BT but is usually flat strips of copper, sometimes in a ribbon cable or even inside a plastic module. Anything as long as the length is applicable to the wavelength of the received carrier signals
Just some places that I would check
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