PayPal used to do the same thing, but even worse they weren't consistent about it. The page to create your password truncated it, but the login page did not. I found out the hard way when I couldn't log in because of that stupid behavior.
Thankfully they fixed it at some point, but it's absolutely mind blowing to me that anyone thought it was acceptable in the first place.
This drove me absolutely crazy as well and I was equally shocked that anyone thought it was a good idea. Ended up going through several rounds of password resets before figuring it out. Further reinforced the perception that PayPal is a crap company and continue to avoid using them as much as possible.
Thankfully they fixed it at some point, but it's absolutely mind blowing to me that anyone thought it was acceptable in the first place.