Thanks for your suggestions!
I have an API key and have verified it’s working from another plugin.
Running on a fresh deployment of WordPress 5.3.2 using the twenty twenty theme.
I can’t see the thread you linked but the location I’m testing with can be successfully found with another plugin using the API.
I’ve tried adding the following to wp-config.php but see nothing relevant in the log.
define( 'WP_DEBUG', true );
define( 'WP_DEBUG_LOG', '/tmp/debug.log');
define( 'WP_DEBUG_DISPLAY', false);
Opening the Network pane in Chrome’s inspector, I don’t see any requests to maps.googleapis.com. I’ve checked that Maps Integration is enabled in settings.