CallbackURL being truncated on sign up

When I sign up via email + password, the url looks correct in the email i.e.

http://localhost:3000/auth/sign-in?provider=credentials&newUser=true

http://localhost:3000/auth/sign-in?provider=credentials&newUser=true

http://localhost:3000/auth/sign-in?provider=credentials&newUser=true

http://localhost:3000/auth/sign-in?provider=credentials&newUser=true

But when I click the link, it takes me to:

http://localhost:3000/auth/sign-in?provider=credentials

http://localhost:3000/auth/sign-in?provider=credentials

http://localhost:3000/auth/sign-in?provider=credentials

http://localhost:3000/auth/sign-in?provider=credentials

he middleware logs show for ctx.query:

"query":{"token":"[Redacted]","callbackURL":"http://localhost:3000/auth/sign-in?provider=credentials","newUser":"true"}

"query":{"token":"[Redacted]","callbackURL":"http://localhost:3000/auth/sign-in?provider=credentials","newUser":"true"}

"query":{"token":"[Redacted]","callbackURL":"http://localhost:3000/auth/sign-in?provider=credentials","newUser":"true"}

"query":{"token":"[Redacted]","callbackURL":"http://localhost:3000/auth/sign-in?provider=credentials","newUser":"true"}