Issue with multisite new user registration

[onehare]

I replicated this issue with a brand new install.

I am using multisite setup. I updated to WP 5.5 and noticed it no longer allows you to register for the individual site. In this example(testsite1 is the sub-site), When a user clicks register -> test.com/testsite1/wp-login.php?action=register It'll redirect the user to the main site -> test.com/wp-signup.php

When you sign up using that page, the user is not connected to any site within the network. However, the user does appear in wp-admin/network/users.php