Vim 9.0.1420 update: opening the same file twice without warning message is unfortunately now possible?

I observed that in the recent update for Vim, specifically vim 9.0.1420, it is now possible to create a text file, open it, and then open the same file through another terminal window without encountering the familiar warning message related to .swp files. This message was previously displayed before the update and helped prevent editing an already open file. What alterations have been made to cause this change? Thank you.

Minimal working example:

$ vim test.txt
write some words
open another terminal
$ vim test.txt

The file can be opened twice without the warning message that used to appear.

You have some customization that affects this, because my vim installation works fine and warns about a temporal file for this file