Display in navigation checkbox is gone

Hi,

With our Development database the "Display in navigation" checkbox for content types has disappeared for all content types, across all sites.
Strange is, if the same codebase running on another database like Test and Int databases, the checkbox is there.
In the code the checkbox is never (deliberately) hidden. I tried to look for hacks in code for this property, but there is not any:
    public virtual bool VisibleInMenu

    {

      get => (bool) (this["PageVisibleInMenu"] ?? (object) false);

      set => this["PageVisibleInMenu"] = (object) value;

    }

Do you have any ideas how to track this down, how to get it back for that particular database?

I searched in the database for PageVisibleInMenu, but I could not find a way to hide/show it.

I found I can change the value in the database directly, but it is not a good solution on the long term.

Regards,

Zsolt