@Ayesh Nipun there seems to be some configuration problem at your end as I could not replicate the issue in my B2C test tenant. Are you using built-in user flow or custom policies? Have you tried using default page layout to see if you still face the issue?
Could you please send working and non-working fiddler at azcommunity[at]microsoft[com]com, so that we can further look into the problem and reach out to you via email.