Edits with polls won't save, and instead error out. The error is:
Database error A database query error has occurred. This may indicate a bug in the software. [f1c31dbe91e160c7a0e6cea6] 2021-04-04 18:54:38: Fatal exception of type "Wikimedia\Rdbms\DBQueryError"
To replicate, try adding the following to any page on rottenwebsiteswiki:
<poll> Do you like the new Main Page? Yes No </poll>