In the current betas of iOS 15.4, iPadOS 15.4 and macOS Monterey 12.3, Apple has slightly improved the way Safari stores passwords. Currently, Safari sometimes stores a password without a username, which can cause confusion later on. This will change in the future.
In iOS 15.4, iPadOS 15.4, or macOS Monterey 12.3, when you're prompted to save a password to iCloud Keychain and Safari only recognized one password, a window will open asking for a username. The popup states:
iOS 15.4 and Co. improve the iCloud keychain
To save this password, enter the username for your [website] account.
The details of the new feature were provided by Ricky Mondello, an Apple employee for Safari, communicatedafter being asked about it on Twitter. Mondello said Apple made the change to address a "pain point" in how Safari and iCloud Keychain work. The update will actually reduce the cases where a password is saved without a username. iOS 15.4 also adds notes to iCloud Keychain and allows users to hide password update notifications - so there are some useful new features. (Photo by Unsplash / Vojtech Bruzek)