Form edits don’t save | WordPress.org

I fixed the “Active PHP session was detected” issue by changing the below line in registration_magic.php, but this seems to cause the unable to save issue. Reverting this change makes it so I can save, but now I still have the “Active PHP session was detected” issue.

208c208,210
<             session_start();
---
>             session_start( [
>                 'read_and_close' => true,
>             ] );