Update modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: rc-glean

modules/openapi-generator/src/main/java/org/openapitools/codegen/OpenAPINormalizer.java

@@ -858,7 +858,14 @@ protected void normalizeProperties(Map<String, Schema> properties, Set<Schema> v
 
             // remove x-internal if needed (same logic as normalizeComponentsSchemas)
             if (property.getExtensions() != null && getRule(REMOVE_X_INTERNAL)) {
-                if (Boolean.parseBoolean(String.valueOf(property.getExtensions().get(X_INTERNAL)))) {
+                Object xInternalValue = property.getExtensions().get(X_INTERNAL);
+                boolean isInternal = false;
+                if (xInternalValue instanceof Boolean) {
+                    isInternal = (Boolean) xInternalValue;
+                } else if (xInternalValue instanceof String) {
+                    isInternal = Boolean.parseBoolean((String) xInternalValue);
+                }
+                if (isInternal) {
                     property.getExtensions().remove(X_INTERNAL);
                 }
             }