I know this is an old post but I have ran into the same issue, im not sure if its because of me or not but I had the map working in an old build that I have not change, I tried to rebuild it a few days ago and got the “Something has gone wrong. Check your blocks and reset this page.” Dialog.
Here are my blocks:
It is meant to draw a line from the users location to the marker.
I am using an Samsung Galaxy S10e to test that is up to date with its software