Our hosting company upgraded our server from mysql 5.7.44 to version 8.0 without even notifying us first.

Now we have weird characters showing all over the forums. This is one example:
https://www.stovebolt.com/ubbthread...-chevrolet-3100-project.html#Post1526670 (See attached screenshot).
Is there a way to fix this globally? Or do we have to fix each one manually?
Before the upgrade, I had already converted the tables to utd8mb4 (in preparation for the upgrade), and we were not seeing these issues. So, I think it's something strange that happened during the ugprade.