Saving the password truncates but validation doesn’t. So it just fails every time you try to log in with no explanation. The number of times I have seen this in a production website is too damn high.

The school buses don’t have seatbelts.

You can simply log this response. Then developers know to replace that call in the next version. If you have unit tests that look for this then you can be sure that your next version is not using any deprecated API calls.