Second form on preference page again not working?

Your software
My Mautic version is: 3.2.5

Your problem
My problem is: I try to add another form to the custom preference page (for unsubscribe all). However… the second form (custom form) will not be displayed in production (only on preview page).

There was a former bug solved: Allow use any form on preference center by kuzmany · Pull Request #6404 · mautic/mautic · GitHub

Is this a regression? Are you successfully using another form on a preference page?