In password security, the longer the better. With a password manager, using more than 24 characters is simple. Unless, of course, the secure password is not accepted due to its length. (In this case, through STOVE.)
Possibly indicating cleartext storage of a limited field (which is an absolute no-go), or suboptimal or lacking security practices.
That doesn’t help if someone got a list of their hashes somehow. Then an attacker can use their own system to crack them.
And that’s if they aren’t just storing the passwords as clear text to begin with, which length limitations are often a sign of.