I don't know why but suddenly, after 4 days, it just started to work, maybe some update including bugfix?

@leocg Yes it is filled in Opera's default opera://settings/passwords
https://imgur.com/a/bK2YOrW
https://imgur.com/a/zWWZzpJ
https://imgur.com/a/EnQ1ig0

@sgunhouse Dropping is not the issue, just after dropping I have to fill login and password manually as it is not autofilling it, even after selecting the username from the dropdown - the password is not being filled

@leocg Only some usernames, but password is not being autofilled. No I am not using any password manager

@sgunhouse all websites login credentials, for example AWS (signin.aws.amazon.com)
Whenever I enter that website (it is dropping you about once a day), It never fills the sign in forms

Opera's autofill not working, I've tried all possible solutions such as reinstalling, clearing browsing data, making sure that I Actually Have That Login Credentials, I've done everything, it just stopped working