I’m having issues with the latest realeses of both HFB and Polylang. Automatic updates were active for all plugins.
For now, I have rolled back to HFB 1.16.14 and Polylang 3.4.3 and it’s working well
I had the same issue yesterday. Today I found out that all the sites that also have Polylang installed present problems like this.
For me deactivating polylang worked, the menu and everything else works well in one of the sites, but some other sites require polylang and are still broken.