Fork Form blank after upgrading to 15.0

Back in August last year I posted about the loss of fork functionality when we upgraded to 14.2. This turned out to be the (then) ‘experimental’ fork form interface which we duly disabled and returned to work. Having now upgraded to GitLab 15 this non-functional form has come back and

Feature.disable(:fork_project_form)

in the rails shell does not help.

When viewing the browser console we see the following when clicking on the fork button…

TypeError: null is not an object (evaluating ‘this.restrictedVisibilityLevels.length’) — (fork_form.vue:212)
TypeError: undefined is not an object (evaluating ‘e.form.fields’) — (fork_form.vue:1:468)

Thanks,

Oh forgot to say, we are using LDAP accounts.

I appear to have solved this. Settings > General > Import sources didn’t have GitLab export ticked.