问题
We recently updated our Wagtail site and the page selector drawer is now blank. I don't see any JavaScript errors or server-side errors.
Just looking for help on what I should be investigating. I can confirm this doesn't happen on a fresh install of Wagtail 2.5. I've also run fixtree.
来源：https://stackoverflow.com/questions/58137551/menu-navigator-disappeared-after-upgrading-to-wagtail-2-6-from-2-5