After the recent update, I am no longer seeing my full list of available logins for sites in Chrome

I have the same issue. To me it looks like the desktop integration is borked. Even when enabled, desktop integration doesn't work and the browser extension no longer sees all the accounts added to 1P desktop. I had to add the missing 1P accounts to the browser extension settings manually.

This is on macOS Monterey public beta, so I didn't think much of it (assuming compatibility isn't there yet).