"Network boundary shield blocked suspicious request" on specific websites

Description: Certain websites show the following behaviour: (1) The normal log-in boxes (Username and Password entry prompts) will not allow me to enter text. (2) After a short while, the page freezes and mousing-over buttons or text entry fields does not change the cursor as I would expect. (3) Brave starts throwing dozens of pop-up “Network boundary shield blocked suspicious request” errors into the Windows Message Centre in rapid succession, with an additional message “Request from [website url] to blocked.” (4) These error messages keep coming even when I close the offending website, and only stop if I close Brave. (5) Private Browser mode seems to work somewhat better (I don’t get the error messages, but the site does lock up). (6) Clearing cookies does nothing.

Exact URL of the website in question: kijiji.ca/t-login.html and https://authentication.td.com/uap-ui/?consumer=easyweb&locale=en_CA#/uap/login

Did the issue present with default Shields settings? (yes/no) Even with default Shields there is an issue.

Does the site function as expected when Shields are turned off? NO. Turning Shields off does nothing.

Is there a specific Shields configuration that causes the site to break? If so, tell us that configuration. (yes/no): Not that I can see, I’ve tried every possible combination.

Does the site work as expected when using Chrome? Yes, they work fine with a fresh install of Chrome.

Brave version (check About Brave): 1.33.106 – This problem has only cropped up in the last month or two.

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