Trying to Start MySQL Server and Getting "Could not start server: argument 2: <class 'TypeError'>: wrong type"

I have the same issue and I've installed the developers default version of the MySQL-Workbench with the installer. I recently updated my hardware and reinstalled Windows 10, maybe it's a bug of Windows 20H2 or of the Workbench itself?

I found a workaround: Use the CMD or the Powershell to start or stop the MySQL-Service of the server. In my case, it has the name MySQL80. Take a look in your services of windows when the commands below are not working.

Use net start MySQL80 to start the server. Use net stop MySQL80 to stop the server.

Remember to open the CMD or the Powershell as Administrator. I think this issue is a bug of the workbench itself because the service is start and stopable with the command line.