If-Menu option not saving

On my website’s main menu, I have a custom link for “Log Out.” I’ve put this as an If-Menu option, “Show if user is logged in.” It was working. It is now not, and no matter how many times I re-enter this and save the menu, it doesn’t actually save the If-Menu setting (so is always showing the “Log Out” menu option.

I notice that on another site I run (with largely the same menu set-up), there is an If-Menu option “if user is logged in for current site” which is missing in the dropdown menu of options for this setting. Both sites are running WP 6.6. and version 0.18.0 of the plugin.

Does anyone have any ideas why this might not be saving?

The page I need help with: [log in to see the link]