Is this bug reproducible?
Sometimes but not reliably in 4.1b18.
Which devices did this bug appear on and is it reproducible on any devices?
A quick summary of the bug:
1PW seems to sometimes accept typing more than four digits when prompting for quick unlock code. If you type a correct code it makes you wait a long time before unlocking.
Detailed Step-by-step instruction on how to reproduce it:
1. Open 1PW and after submitting master password, switch to another app.
2. Switch back to 1PW and type quick unlock code. Sometimes it opens immediately but frequently it will accept more than four digits and if you type the correct code there will be a significant delay before it opens.