GDPDR email confirmation link redirects with no params

Description: In “admin->tools->export personal data” I send email to the user asking them to verify the request. User receives the request with the link:

https://www.example.com/login/?action=confirmaction&request_id=131&confirm_key=FQVs6ymNj6AQgcLSOIX5

When following the link the page redirects to:

https://www.example.com/confirmaction/

…and shows text “Invalid request.”.

Environment: WordPress 4.9.8, with only two plugins: Theme My Login 7.0.1 and WP Mail SMTP 1.3.3; and Twenty Sixteen theme.

Comment:

I observe that “/includes/actions.php” file line 622 calls ‘wp_die’ because all GET request parameters have disappeared after the redirect.

If I substitute “/login/?” with “/wp-login.php” in the email link like this:

https://www.example.com/login/?action=confirmaction&request_id=131&confirm_key=FQVs6ymNj6AQgcLSOIX5

then request completes as expected, except obviously without rendering via TML template.