diff --git a/changelog/fix-7967-disputed-order-notice-test-mode-check b/changelog/fix-7967-disputed-order-notice-test-mode-check
new file mode 100644
index 00000000000..43f8af2c81b
--- /dev/null
+++ b/changelog/fix-7967-disputed-order-notice-test-mode-check
@@ -0,0 +1,4 @@
+Significance: patch
+Type: fix
+
+Fix network error that occurs when viewing an test mode order with test mode disabled, and vice versa.
diff --git a/client/order/index.js b/client/order/index.js
index 1bfdfeee7ad..16ec2b60183 100644
--- a/client/order/index.js
+++ b/client/order/index.js
@@ -61,6 +61,9 @@ jQuery( function ( $ ) {
 	const manualRefundsTip = getConfig( 'manualRefundsTip' ) ?? '';
 	const chargeId = getConfig( 'chargeId' );
 	const testMode = getConfig( 'testMode' );
+	// Order and site are both in test mode, or both in live mode.
+	// '1' = true, '' = false, null = the order was created before the test mode meta was added, so we assume it matches.
+	const orderTestModeMatch = getConfig( 'orderTestModeMatch' ) !== '';
 
 	maybeShowOrderNotices();
 
@@ -175,7 +178,7 @@ jQuery( function ( $ ) {
 			'#wcpay-order-payment-details-container'
 		);
 
-		// If the container doesn't exist (WC < 7.9), or the charge ID isn't present, don't render the notice.
+		// If the container doesn't exist (WC < 7.9) don't render notices.
 		if ( ! container ) {
 			return;
 		}
@@ -184,7 +187,7 @@ jQuery( function ( $ ) {
 			<>
 				{ testMode && <TestModeNotice /> }
 
-				{ chargeId && (
+				{ chargeId && orderTestModeMatch && (
 					<DisputedOrderNoticeHandler
 						chargeId={ chargeId }
 						onDisableOrderRefund={ disableWooOrderRefundButton }
diff --git a/includes/admin/class-wc-payments-admin.php b/includes/admin/class-wc-payments-admin.php
index 0aa9f9dd03c..e6f74194d25 100644
--- a/includes/admin/class-wc-payments-admin.php
+++ b/includes/admin/class-wc-payments-admin.php
@@ -723,6 +723,23 @@ public function enqueue_payments_scripts() {
 
 			if ( $order && WC_Payment_Gateway_WCPay::GATEWAY_ID === $order->get_payment_method() ) {
 				$refund_amount = $order->get_remaining_refund_amount();
+
+				// Check if the order's test mode meta matches the site's current test mode state.
+				// E.g. order and site are both in test mode, or both in live mode.
+				$order_mode = $order->get_meta( WC_Payments_Order_Service::WCPAY_MODE_META_KEY );
+				if ( '' === $order_mode ) {
+					// If the order doesn't have a mode set, assume it was created before the order mode meta was added (< 6.9 PR#7651) and return null.
+					$order_test_mode_match = null;
+				} else {
+					$order_test_mode_match = (
+						\WCPay\Constants\Order_Mode::PRODUCTION === $order_mode &&
+						WC_Payments::mode()->is_live()
+					) || (
+						\WCPay\Constants\Order_Mode::TEST === $order_mode &&
+						WC_Payments::mode()->is_test()
+					);
+				}
+
 				wp_localize_script(
 					'WCPAY_ADMIN_ORDER_ACTIONS',
 					'wcpay_order_config',
@@ -736,6 +753,7 @@ public function enqueue_payments_scripts() {
 						'chargeId'              => $this->order_service->get_charge_id_for_order( $order ),
 						'hasOpenAuthorization'  => $this->order_service->has_open_authorization( $order ),
 						'testMode'              => \WCPay\Constants\Order_Mode::TEST === $order->get_meta( WC_Payments_Order_Service::WCPAY_MODE_META_KEY ),
+						'orderTestModeMatch'    => $order_test_mode_match,
 					]
 				);
 				wp_localize_script(