I'm running 5.3 (503005) on an iPhone 6 with iOS 8.2 (12D5480a) but I've been having this issue for several versions of shipping OS and shipping OPW app.
My workflow for logging into my Wells Fargo account is to open one password, use fingerprint to unlock the vault and then tap favorites if needed. My wells fargo is there, so I tap it. Then I tap on the password field intending to copy the password.
The first time I launch the app - the Copy | Reveal | Large Type - flashes and then disappears immediately. So I have to tap again and then copy the password.
Is it possible to let the first tap keep the copy button open?
Let me know if you'd like diagnostics or a video of this happening if it's not readily reproducible on your end.