I Downloaded the AppImage and ran it, looks like it runs in X11 mode, even though my desktop is Wayland.
This has two issues, the first being a security issue which I think would concern you the most.
On X11, any application can easily "see" what other applications are rendering on-screen. This means that any other local application can spy on what the 1Password window (e.g.: other local applications can see my secrets!).
The other problem is that XWayland doesn't support scaling, so the 1Password window is super blurry (I guess that wouldn't be the problem if you have low resolution screens).
1Password Version: latest
Extension Version: n/a
OS Version: ArchLinux
Sync Type: n/a