In most forum software, when a subforum is password-protected, the "Last Post" section displays a message like "Password protected" or similar if a user has not entered the password before. While in MyBB you can choose to completely hide the password-protected forum altogether, this requires creating special usergroups to display the forum for those who should have access, leading to more complication than necessary.
By default, MyBB simply shouldn't display threads in the "Last Post" sections of password-protected forums, unless the user has actually entered the password.
By default, MyBB simply shouldn't display threads in the "Last Post" sections of password-protected forums, unless the user has actually entered the password.