Spark/Cashier - INR Symbol Issue

We have our payment plans in INR (instead of USD). The same currency is configured in Stripe, and the transaction works well.

However, when we download and open the invoice, we see "?" symbol instead of '₹' (INR symbol).

We have the following config in our env CASHIER_CURRENCY=inr CASHIER_CURRENCY_LOCALE=en CASHIER_MODEL=App\User

Any suggestions on how to fix the issue?