Unable to fill into Safari after updating to macOS Ventura

I am having this autofill issue also, but with latest version of Safari. Also 1Password for Safari, which was updated 2 days ago and was working fine, has stopped working since I updated to this latest Ventura update. I, too, have quit Safari, 1 Password and rebooted computer twice. No joy.

1Password Version: 1Password for Mac 8.10.9 81009046, on PRODUCTION channel
Extension Version: 2.14.0
OS Version: Version 13.5.1 (22G90)
Browser: Safari 16.6 (18615.3.12.11.2)

The 1Password folks have said this is a known issue. Here are the details from their email:

I can confirm it is a known issue you are experiencing and our devs are fully aware of and are currently investigating. Hopefully, the issue would be patched up soon. Meanwhile, can you try the following steps to see if we could get things back on track: 

1. Open & unlock the 1Password desktop app by manually typing your account password. Leave it running in the background. 
2. Open your browser(s) and right-click on the 1Password icon in the browser toolbar. 
   • Here's a guide on if you don't see the 1Password icon in your browser's toolbar
3. Select Settings.
4. In the General section, turn off Integrate with 1Password app.
5. Scroll down to the "Accounts & Vaults" section or click it on the left side panel.
6. Find the account(s) there, and click the three-dot icon to select Sign Out. 
7. Turn back on the "Integrate with 1Password app" option as we disabled in step 4 above.
   • Wait a few seconds and see if the account(s) signed in the desktop app would be added in the browser automatically

I apologize in advance if the above steps didn't help either. Suppose that is the case. Let's disable the integration option temporarily, as mentioned in step 4 above, and use 1Password in the browser independently before the update fixes the issue and the autofill function should be working properly. However, we will need to unlock 1Password in the browser separately until the issue is resolved. 

So, I want to share a quick way of unlocking 1Password in the browser by using the Universal Autofill feature of the 1Password 8 desktop app. I am using Safari as the demo here:

1. Open & unlock 1Password 8 desktop app.
2. Open Safari. 1Password for Safari is locked as the integration feature is turned off.
3. Click the 1Password for Safari icon in the toolbar area to bring up the window to unlock.
4. Hit the "cmd + \" shortcut to bring up the Quick Access window of 1Password 8. Search for your 1Password account login item and hit enter to "Autofill".
5. You will see the password is filled and submitted in the login window of 1Password for Safari.

I also created a demo GIF to show you the process:

I have exactly the same problem. In short, the extension version 2.14.0 is simply not usable with Safari. Same symptoms, nothing helps. The 1Password guys seem to have completely broken it. @ankushnarula can you please tell me how to downgrade it on M1/Ventura? I'm in a desperate need.

PS. Oops, mixed two forum threads. The downgrade is in another one. Sorry, I figured out how to do that anyway (using a Time Machine backup).