The 'Widget Connector' only appears to work with a very specific URL from Google Maps. Due to a recent update in Google's side, it doesn't seem to be possible to generate links like this one anymore:

https://maps.google.com/maps?q=Atlassian,+George+Street,+New+South+Wales,+Australia&hl=en&ll=-33.866572,151.207001&spn=0.004321,0.008256&sll=-33.870509,151.203707&sspn=0.008641,0.016512&oq=atlassian,&hq=Atlassian,+George+Street,+New+South+Wales,+Australia&radius=15000&t=m&z=18&iwloc=A

Even when accessing the link above directly, the URL gets automatically converted to:

https://www.google.com/maps/place/Atlassian/@-33.866572,151.207001,18z/data=!4m2!3m1!1s0x6b12ae408eafffbf:0xe6e6afa8ffbe707?hl=en

This last URL doesn't seem to be automatically converted using the 'Widget Connector', thus failing to display/render the map inside a Confluence page.

Workaround

Tried multiple ways to workaround the situation and get the old URL from Google, but we're constantly getting directed to the new URL format. At the moment, we don't have a workaround to this scenario.