It happens with original music that doesn't conform to the norms of its day: https://www.honest-broker.com/p/why-did-the-beatles-get-so-m...
It happens with original paintings that don't conform to the norms of their day: https://medium.com/@parkwestgallery/park-west-gallery-review...
It happens with original films that don't conform to the norms of their day: https://screenrant.com/great-movies-panned-critics/
By all accounts, "Megalopolis" is an original work of art that doesn't conform to today's conventional norms. Only with the passage of time will we be able to recognize if it is genius or folly.