This is a pretty basic and universal keyboard command so I"m surprised it's broken. I wonder if this is a recent break as I'm sure to have noticed it before. Blame my bad typing but I regularly hit ⌘-A to select and replace what I've typed with the corrected version and that isn't working. I restarted 1Password to no avail.
1Password Version: 8.9.0 (80900001, on BETA channel)
Extension Version: Native app
OS Version: macOS 12.4
Browser:_ Native app