unless v2 has wifi or a real gps (again, will require new radio tech, at cost of battery life) this 'dead zone' wont change.
In practical attempts, I've always had much easier time finding my Apple Airtags versus the third party find my, because of the UWB radio for location. Third party only use Bluetooth.
Put in another way, even though they have 'gone missing' along with the item, I've never not recovered an Airtag (except the one that met a watery death!). Have you?
Is this a real problem? Or maybe you want a GPS locator with the same form factor and battery life? Good luck!