The following problems were observed editing logged out. I have not tested them when logged in to an account.
When a page is protected in the normal way, such as my userpage https://en.m.wikipedia.org/wiki/User:BethNaught , the mobile interface issues a pop-up when the edit icon is pressed and the editor redirects back to the page, if the user does not have sufficient permissions to edit.
However, when a page is not 'protected' but instead the title blacklist prevents its editing or creation, the editing interface opens and the user is allowed to proceed up to pressing the save button,
on which the uninformative and unfriendly message "Error, edit not saved" pops up (this part was fixed as T65335).
The following pages on English Wikipedia are blocked from non-autoconfirmed creation and editing respectively by the blacklist: https://en.m.wikipedia.org/wiki/Talk:Morgan_is_a_moron , https://en.m.wikipedia.org/wiki/User_talk:Bonadea/Editnotice . The above-mentioned issue can be seen here.
For consistency with normal protection and for user-friendliness, the mobile site should recognise title blacklist prohibitions and prevent access to the editor in cases where the user does not have sufficient permissions. Moreover the error message should be appropriately informative.