Django UserPassesTestMixin raises an unhandled exception

Question

I'm using the UserPassesTestMixin on one of my views. It works fine, but every time a user fails the test (test_func returns False), an exception is raised in the server:

Forbidden (Permission denied): /m/chats/8/
Traceback (most recent call last):
  ...
  .../django/contrib/auth/mixins.py", line 48, in handle_no_permission
    raise PermissionDenied(self.get_permission_denied_message())
django.core.exceptions.PermissionDenied: Sorry, you can't access this chat.
[11/Apr/2022 11:53:04] "GET /m/chats/8/ HTTP/1.1" 403 135

Why doesn't it just show the last line? Like a 404 error when using a get_object_or_404 function. And also, it only uses the permission_denied_message attribute that I set for the exception message and it is not shown to the user.

I know that I can override the handle_no_permission method, but is there a better way? Why does this even happen? get_object_or_404 raises an exception too; so how come that one is handled and this one is not??