Checkbox “Hide URL … for default language” drops frequently …

… rendering all page content on frist level menu empty.

Settings as in https://stefankremer.cloud/index.php/s/QQsTHnMJrfJPbGW

If the checkbox drops (which for some reasons happens quite frequently). The content of the pages (all languages) on the first menu level is rendered empty. Only header/footer remain. Pages on a sub-menu level appear correctly.

How can we solve that this setting is permantly perserved?

best regards Stefan