Using DD4T I noticed that the cursor isn’t shown when typing into the username and password fields during login. Initially, this lead me to think that the instance wasn’t working correctly.
Typing is shown correctly, but for example if you click to correct a character the new position of the cursor isn’t shown.
Once logged in, cursor is shown fine.
Shown using Firefox 88.0.1 (Linux)
and Chromium 91.0.4472.77 (Linux)