diff --git a/assets/js/plugin-check-admin.js b/assets/js/plugin-check-admin.js
index e75220958..a12a92ca3 100644
--- a/assets/js/plugin-check-admin.js
+++ b/assets/js/plugin-check-admin.js
@@ -756,6 +756,7 @@
 	) {
 		let isSuccessMessage = true;
 		let aiStats = null;
+		const failedChecks = [];
 		for ( let i = 0; i < checks.length; i++ ) {
 			try {
 				const results = await runCheck(
@@ -811,15 +812,17 @@
 						);
 					}
 				}
-			} catch {
-				// Ignore for now.
+			} catch ( error ) {
+				console.error( error );
+				failedChecks.push( checks[ i ] );
 			}
 		}
 
 		renderFalsePositiveResults();
 		const resultsMessage = renderResultsMessage(
 			isSuccessMessage,
-			aiStats
+			aiStats,
+			failedChecks
 		);
 
 		// Announce the check results summary so screen-reader users know
@@ -830,16 +833,35 @@
 		}
 	}
 
+	/**
+	 * Substitutes printf-style placeholders in a translated string.
+	 * Handles both simple (%d, %s) and positional (%1$d, %2$s) placeholders.
+	 *
+	 * @since n.e.x.t
+	 *
+	 * @param {string}             template The translated format string.
+	 * @param {...(string|number)} args     Replacement values.
+	 * @return {string} Formatted string with placeholders replaced.
+	 */
+	function sprintfReplace( template, ...args ) {
+		let i = 0;
+		return template.replace( /%(\d+\$)?[ds]/g, function ( _match, pos ) {
+			const index = pos ? parseInt( pos, 10 ) - 1 : i++;
+			return args[ index ] !== undefined ? args[ index ] : _match;
+		} );
+	}
+
 	/**
 	 * Renders result message.
 	 *
 	 * @since 1.0.0
 	 *
-	 * @param {boolean} isSuccessMessage Whether the message is a success message.
-	 * @param {Object}  aiStats          AI statistics.
+	 * @param {boolean}  isSuccessMessage Whether the message is a success message.
+	 * @param {?Object}  aiStats          AI statistics.
+	 * @param {string[]} failedChecks     Slugs of checks whose request did not complete.
 	 * @return {string} The rendered results message.
 	 */
-	function renderResultsMessage( isSuccessMessage, aiStats ) {
+	function renderResultsMessage( isSuccessMessage, aiStats, failedChecks ) {
 		// Count errors and warnings to determine notice severity and compose the message.
 		const { errorCount, warningCount } = isSuccessMessage
 			? { errorCount: 0, warningCount: 0 }
@@ -860,27 +882,6 @@
 		if ( isSuccessMessage ) {
 			messageText = pluginCheck.successMessage;
 		} else {
-			/**
-			 * Substitutes printf-style placeholders in a translated string.
-			 * Handles both simple (%d, %s) and positional (%1$d, %2$s) placeholders.
-			 *
-			 * @param {string}    template The translated format string.
-			 * @param {...string} args     Replacement values.
-			 * @return {string} Formatted string with placeholders replaced.
-			 */
-			function sprintfReplace( template, ...args ) {
-				let i = 0;
-				return template.replace(
-					/%(\d+\$)?[ds]/g,
-					function ( _match, pos ) {
-						const index = pos ? parseInt( pos, 10 ) - 1 : i++;
-						return args[ index ] !== undefined
-							? args[ index ]
-							: _match;
-					}
-				);
-			}
-
 			// Build the individual count parts with proper plural/singular forms.
 			let errorPart = '';
 			if ( errorCount > 0 ) {
@@ -926,6 +927,20 @@
 			}
 		}
 
+		// A check whose request did not complete has no results, so the counts above cannot speak for it.
+		if ( failedChecks && failedChecks.length ) {
+			messageType = 'error';
+
+			const failedText = sprintfReplace(
+				pluginCheck.failedChecksMessage,
+				failedChecks.join( ', ' )
+			);
+
+			messageText = isSuccessMessage
+				? failedText
+				: messageText + ' ' + failedText;
+		}
+
 		if ( aiStats ) {
 			const aiParts = [];
 			const modelsUsed = [
diff --git a/includes/Admin/Admin_Page.php b/includes/Admin/Admin_Page.php
index 3478c19e0..1e4ba718c 100644
--- a/includes/Admin/Admin_Page.php
+++ b/includes/Admin/Admin_Page.php
@@ -218,6 +218,8 @@ public function enqueue_scripts() {
 					'summaryBothTemplate'             => __( '%1$s and %2$s found.', 'plugin-check' ),
 					/* translators: %s: Formatted issue count string (e.g. "3 errors" or "2 warnings"). */
 					'summarySingleTemplate'           => __( '%s found.', 'plugin-check' ),
+					/* translators: %s: Comma-separated list of check slugs. */
+					'failedChecksMessage'             => __( 'These checks could not be completed and their results are unknown: %s.', 'plugin-check' ),
 					'strings'                         => array(
 						'checkingPlugin' => __( 'Running plugin checks…', 'plugin-check' ),
 						'exportCsv'      => __( 'Export CSV', 'plugin-check' ),