diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RouterFunctions.java b/spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RouterFunctions.java
index 33e34568d0b..661d1e8e660 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RouterFunctions.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/function/server/RouterFunctions.java
@@ -1265,9 +1265,13 @@ public abstract class RouterFunctions {
 								return this.routerFunction.route(nestedRequest)
 										.doOnNext(match -> {
 											if (nestedRequest != serverRequest) {
-												serverRequest.attributes().clear();
-												serverRequest.attributes()
-														.putAll(nestedRequest.attributes());
+												// new attributes map from nestedRequest.attributes() can be composed of the old attributes,
+												// which means that clearing the old attributes will remove those values from new attributes as well
+												// so let's make a copy
+												Map<String, Object> newAttributes = new LinkedHashMap<>(nestedRequest.attributes());
+												Map<String, Object> oldAttributes = serverRequest.attributes();
+												oldAttributes.clear();
+												oldAttributes.putAll(newAttributes);
 											}
 										});
 							}
diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/function/RouterFunctions.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/function/RouterFunctions.java
index 7e8a42004fa..4a10d726127 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/function/RouterFunctions.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/function/RouterFunctions.java
@@ -1181,8 +1181,13 @@ public abstract class RouterFunctions {
 								Optional<HandlerFunction<T>> result =
 										this.routerFunction.route(nestedRequest);
 								if (result.isPresent() && nestedRequest != serverRequest) {
-									serverRequest.attributes().clear();
-									serverRequest.attributes().putAll(nestedRequest.attributes());
+									// new attributes map from nestedRequest.attributes() can be composed of the old attributes,
+									// which means that clearing the old attributes will remove those values from new attributes as well
+									// so let's make a copy
+									Map<String, Object> newAttributes = new LinkedHashMap<>(nestedRequest.attributes());
+									Map<String, Object> oldAttributes = serverRequest.attributes();
+									oldAttributes.clear();
+									oldAttributes.putAll(newAttributes);
 								}
 								return result;
 							}