Nobody ever reported any issues related to that for years. Suspected user error.
Different keyboard layout?
Try typing these words in a text editor first before trying to enter these as actual password. Open text editor:
mousepad
Also as long as you didn’t change the default password you can use dsudo without a password to gain root. (dsudo - default password sudo) Just use dsudo instead of sudo.
Example.
dsudo touch /etc/testfile
Can also be used to change the password. But as long as you don’t know how to type the default password, you would probably lock yourself out as you couldn’t type the new password either.