404 for some matching urls too (Version 2)

I do not know the mistake I am likely to be committing. In Django Version 2, I have a feeling that URL matching fails whenever there are query variables. 

When I try to log into Admin module, the login screen comes. But when a 'next' query variable is attached, I get a 404. Similarly when I try to jump to a page in the records listing, I get 404. (Color has been added for highlighting)

http://localhost:8000/admin/login/?next=/admin/

Using the URLconf defined in sundar.urls, Django tried these URL patterns, in this order:

admin/ [name='index']

admin/ login/ [name='login']

admin/ logout/ [name='logout']

admin/ password_change/ [name='password_change']

admin/ password_change/done/ [name='password_change_done']

admin/ jsi18n/ [name='jsi18n']

admin/ r/<int:content_type_id>/<path:object_id>/ [name='view_on_site']

...... (corresponds to the tables defined)

admin/ ^(?P<app_label>rsi|auth)/$ [name='app_list']

login/ [name='login']

logout/ [name='logout']

authissue [name='authissue']

.....

The current path, admin/login/?next=/admin/, didn't match any of these.

Any help is appreciated.

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