“This value must be shorter than 20 characters in length.” … password field, bank website, 2016, wtf ¯\_(ツ)_/¯

For a second, I thought that was the password you were entering...

Microsoft had a limit of 16 characters (not sure if it is still there - try outlook.com)

Banks are somewhat forgivable (considering a tech giant limits their password field length). This is generally done to optimize their hashing algorithm, although it's real benefit is deceptive.