Hi @SwapnasaritMo1,
First to clarify the preserveIsuue option this is only used for making sure the Issue is not removed once the project is created from it.
Next there is a question is the custom form that those fields are available for both Issue and Project objects?
Is the custom form also assigned directly to the template?
Are you using the copy values option within the misc action?

Please check those and let me know once these are done if you still have issues. Hopefully this helps.
Best regards,
Ivan