This also happens when your password manager, for example, generates you a 24 character password which the registration accepted just fine but the login form inexplicably has a limit of 20 characters which has happened to me multiple times somehow.
We have this issue in an internal tool at my workplace. My coworker is the only one who has long enough password and is too stubborn to change it, so they change the (client side) limit every time they log-in.
This also happens when your password manager, for example, generates you a 24 character password which the registration accepted just fine but the login form inexplicably has a limit of 20 characters which has happened to me multiple times somehow.
We have this issue in an internal tool at my workplace. My coworker is the only one who has long enough password and is too stubborn to change it, so they change the (client side) limit every time they log-in.