Make sure the next payment delivery date is set to the next payment date, this will overwrite a filter in the Mollie integration.

functions.php

<?php

/**
 * Make sure the next payment delivery date is set to the next payment date,
 * this will overwrite a filter in the Mollie integration.
 *
 * @link https://github.com/pronamic/wp-pronamic-pay-mollie/blob/main/documentation/Wanneer-worden-incassobetalingen-verwerkt-en-uitbetaald.md
 * @link https://github.com/pronamic/wp-pronamic-pay-mollie/blob/53949bd607d24782a18730a113993d230aa6feac/src/Integration.php#L326-L407
 */
add_filter(
	'pronamic_pay_subscription_next_payment_delivery_date',
	function ( $next_payment_delivery_date, $subscription ) {
		$next_payment_date = $subscription->get_next_payment_date();

		if ( $next_payment_date instanceof DateTimeInterface ) {
			$next_payment_delivery_date = $next_payment_date;
		}

		return $next_payment_delivery_date;
	},
	20,
	2
);