diff --git a/dsl/camel-jbang/camel-jbang-core/src/main/java/org/apache/camel/dsl/jbang/core/commands/ai/PropertiesChecks.java b/dsl/camel-jbang/camel-jbang-core/src/main/java/org/apache/camel/dsl/jbang/core/commands/ai/PropertiesChecks.java
index 4ddc2265e610b..52bf04e7f05ff 100644
--- a/dsl/camel-jbang/camel-jbang-core/src/main/java/org/apache/camel/dsl/jbang/core/commands/ai/PropertiesChecks.java
+++ b/dsl/camel-jbang/camel-jbang-core/src/main/java/org/apache/camel/dsl/jbang/core/commands/ai/PropertiesChecks.java
@@ -21,12 +21,14 @@
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.Set;
 import java.util.function.Function;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 import org.apache.camel.catalog.CamelCatalog;
 import org.apache.camel.catalog.ConfigurationPropertiesValidationResult;
+import org.apache.camel.tooling.model.MainModel;
 
 /**
  * The application.properties checks of {@link SourceValidator}: unknown camel.* options with the option meant, an
@@ -46,6 +48,56 @@ public static List<String> validateProperties(
         return validatePropertiesLines(content, line -> validatePropertyLine(line, catalog, extraPropertyLine));
     }
 
+    /** camel.<group>.<rest>=: the option groups of the main model (resilience4j, faulttolerance, threadpool...). */
+    static final Pattern GROUP_KEY_PATTERN = Pattern.compile("^\\s*camel\\.([a-zA-Z0-9-]+)\\.([^=\\s]+)\\s*=");
+
+    /** The camel.* prefixes whose keys legitimately nest, or that other checks own. */
+    private static final Set<String> NESTING_GROUPS = Set.of("component", "dataformat", "language", "beans", "variable",
+            "kamelet", "jbang", "route-template", "routeTemplate", "main", "rest", "server", "management");
+
+    /**
+     * camel.resilience4j.circuitbreaker.supplierCircuitBreaker.slidingWindowSize=4, an invented per-id form: the
+     * catalog accepts it and the run dies at startup ("Cannot find getter method: supplierCircuitBreaker on bean: class
+     * java.lang.String"). The options of a group are global, one segment after the group; resilience4j is also set per
+     * circuit breaker in the route (CAMEL-24856).
+     */
+    static String nestedGroupKeyHint(String line, CamelCatalog catalog) {
+        Matcher m = GROUP_KEY_PATTERN.matcher(line);
+        if (!m.find()) {
+            return null;
+        }
+        String group = m.group(1);
+        String rest = m.group(2);
+        if (!rest.contains(".") || rest.contains("[") || NESTING_GROUPS.contains(group)) {
+            return null;
+        }
+        MainModel mm = catalog.mainModel();
+        if (mm == null) {
+            return null; // a catalog without the main model: the key goes to the catalog as is
+        }
+        String prefix = "camel." + group + ".";
+        List<String> options = new ArrayList<>();
+        for (var o : mm.getOptions()) {
+            if (o.getName().startsWith(prefix) && !o.getName().substring(prefix.length()).contains(".")) {
+                options.add(o.getName().substring(prefix.length()));
+            }
+        }
+        if (options.isEmpty()) {
+            return null; // not a known group: the catalog reports the key
+        }
+        String first = rest.substring(0, rest.indexOf('.'));
+        String last = rest.substring(rest.lastIndexOf('.') + 1);
+        String option = options.contains(last) ? last : closestName(last, options);
+        String example = "camel." + group + "." + (option != null ? option : options.get(0)) + "=...";
+        String more = "resilience4j".equals(group)
+                ? ", or per circuit breaker in the route: circuitBreaker: {resilience4jConfiguration: {"
+                  + (option != null ? option : "...") + ": ...}}"
+                : "; the options are " + String.join(", ", options.size() > 8 ? options.subList(0, 8) : options)
+                  + (options.size() > 8 ? ", ..." : "");
+        return first + "    Unknown option (camel." + group + " has no nested settings such as " + first
+               + ": its options are global, " + example + more + ")";
+    }
+
     /** Validates one properties line: a {@code camel.*} key against the catalog, any other with the extra check. */
     static final Pattern COMPONENT_KEY_PATTERN
             = Pattern.compile("^\\s*camel\\.(component|dataformat|language)\\.([A-Za-z0-9-]+)\\.");
@@ -76,6 +128,11 @@ public static String validatePropertyLine(String line, CamelCatalog catalog, Fun
                 return name + "    Unknown " + kind + (closest != null ? " (did you mean " + closest + "?)" : "");
             }
         }
+        // camel.resilience4j.circuitbreaker.<id>.<option>: a nested segment under a known option group (CAMEL-24856)
+        String nested = nestedGroupKeyHint(line, catalog);
+        if (nested != null) {
+            return nested;
+        }
         try {
             ConfigurationPropertiesValidationResult result = catalog.validateConfigurationProperty(line);
             if (result.isAccepted()) {
diff --git a/dsl/camel-jbang/camel-jbang-core/src/test/java/org/apache/camel/dsl/jbang/core/commands/ai/SourceValidatorPropertiesTest.java b/dsl/camel-jbang/camel-jbang-core/src/test/java/org/apache/camel/dsl/jbang/core/commands/ai/SourceValidatorPropertiesTest.java
index a9bff80561c0b..b894b3ce1eb97 100644
--- a/dsl/camel-jbang/camel-jbang-core/src/test/java/org/apache/camel/dsl/jbang/core/commands/ai/SourceValidatorPropertiesTest.java
+++ b/dsl/camel-jbang/camel-jbang-core/src/test/java/org/apache/camel/dsl/jbang/core/commands/ai/SourceValidatorPropertiesTest.java
@@ -44,6 +44,25 @@ void unknownComponentInAKeyIsReportedWithTheClosestName() {
         assertThat(msgs.get(1)).startsWith("Line 3: jacksn    Unknown dataformat").contains("did you mean jackson");
     }
 
+    /**
+     * CAMEL-24856: a nested segment under an option group is not a property; the options are global or in the route.
+     */
+    @Test
+    void aNestedKeyUnderAnOptionGroupIsReported() {
+        List<String> msgs = SourceValidator.validateProperties("""
+                camel.resilience4j.circuitbreaker.supplierCircuitBreaker.slidingWindowSize=4
+                camel.resilience4j.slidingWindowSize=4
+                camel.faulttolerance.bulkhead.myPool.enabled=true
+                """, catalog, null);
+        assertThat(msgs).hasSize(2);
+        assertThat(msgs.get(0))
+                .startsWith("Line 1: circuitbreaker    Unknown option (camel.resilience4j has no nested settings")
+                .contains("camel.resilience4j.slidingWindowSize=...")
+                .contains("circuitBreaker: {resilience4jConfiguration: {slidingWindowSize: ...}}");
+        assertThat(msgs.get(1)).startsWith("Line 3: bulkhead    Unknown option (camel.faulttolerance has no nested settings")
+                .contains("the options are");
+    }
+
     @Test
     void wrongMainKeyGetsTheClosestOption() {
         List<String> msgs = SourceValidator.validateProperties("""