Ctrl+V paste auto-submits the card

When using Anki web I sometimes face this annoying issue where after pasting some text it auto-submits the card even though I don't hit the "add" button.

The link of demonstration of the bug: https://tengekking8.neetorecord.com/watch/997064fd4e7b0e3cef6f

I am also interested in debugging this issue, as fixing issue of the tool that I use on a regular basis sounds exciting!

Start by reproducing the Ctrl+V behavior in Anki web using the demonstration link as a reference, then trace which paste and card-submission entry points are involved. Done means pasting text no longer submits the card unless the user explicitly activates the add action.

Written by the indexing model from the issue text.