You need to file a bug report or RFE (request for enhancement) at
https://bugzilla.redhat.com/index.cgi. The developers generally don't read this forum.
I've experienced the same thing with on-line accounts - you enter the password, and it appears to work, but then it doesn't work when you try to login again - either because the password was too long, or it contained illegal characters - but no warning is issued. I saw some NIST document that recommended that passwords be kept shorter than (several?) MEGABYTES - because it would take a long time to hash down (to 128 bits?) !