Anyone experienced 1PW Extension blocking Paste function in Fields?

Thanks steph_giles - I have a related issue (which I think is similar to what others have reported) where 1Password wants to autofill a field and can't. It may be related to my issue in my OP above. This is another transient issue that happens periodically or randomly and often the same site works okay one day and then has the issue the next.

One example is https://mail.protonmail.com and the sign on page for my mail account. The last 6 days I've had 2 days where autofill (incl. the TOTP code) have worked seamlessly and perfectly and the other 4 it correctly identifies the fields (see screenshot below) but just won't fill them no matter what I do (e.g. click on icon in the field, click on the extension button on the browser toolbar), and usually suppresses the 'drop down' box below the field where 1PW shows the entry it's matched to the URL. Oh and yes the URL is correctly matched between the page and what I have in my 1PW entry for that site. In this example I can copy the values from my main 1PW Desktop App in Windows 10 and paste them into the fields on the webpage (incl. the TOTP 2FA code). This is in Brave as per my OP above). I have not as yet tested for a prolonged period (week) in another browser like Firefox or Edge (nor in this case on my MacBook).

P.S. I did post this second issue with Protonmail example separately a few days ago, but that post seems to have gone missing in the ether - perhaps lost somewhere in a queue awaiting moderator approval... Originally I didn't think the 2 issues were likely connected but perhaps they are?