404 error on known site

Description of the issue:
Fanfiction.net has an app that has a separate PM inbox than the one accessible from the desktop. To reach this from my phone, I have to open any links within the browser site “in a new tab” to prevent it from automatically opening the app. When I open the login site page in a new tab, it gives me a 404 error, but it works fine in Chrome. Due to the app, I cannot test whether it works correctly in the same tab. Here is the error message:

How can this issue be reproduced?

  1. In the mobile app, go to fanfiction.net
  2. In the top right corner is the “Login” button. Long press to bring up right click menu
  3. Tap “Open in new tab”. You do not need an account to test this.

Expected result:

Reproduces Consistenly?
yes, every time

Brave Version( check About Brave):
Brave 1.16.75, Chromium 86.0.4240.193
Mobile Device details
Android 8.0.0; SM-G930V Build/R16NW
Additional Information:

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