--- a/src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php
+++ b/src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php
@@ -491,6 +491,23 @@ class ArrayNodeDefinition extends NodeDefinition implements ParentNodeDefinition
         if (false !== $this->addDefaultChildren) {
             throw new InvalidDefinitionException(\sprintf('->addDefaultChildrenIfNoneSet() is not applicable to concrete nodes at path "%s".', $path));
         }
+
+        $pluralFromRemap = isset($this->normalization) ? array_column($this->normalization->remappings, 1) : [];
+
+        foreach ($this->children as $name => $child) {
+            if ($child instanceof self && isset($child->prototype)) {
+                if (!\in_array($name, $pluralFromRemap, true)) {
+                    trigger_deprecation('symfony/config', '7.4', 'Config node "%s" defines a prototyped child "%s" but lacks a matching singular remapping; use the second argument of arrayNode() to define one on that child.', $path, $name);
+                }
+            }
+        }
+
+        foreach ($pluralFromRemap as $plural) {
+            $child = $this->children[$plural] ?? null;
+            if (!$child instanceof self || !isset($child->prototype)) {
+                trigger_deprecation('symfony/config', '7.4', 'Config node "%s" defines a singular remapping for "%s" but has no corresponding prototyped array child.', $path, $plural);
+            }
+        }
     }