fix: clone actionAPIContext preserving accessors

.changeset/dirty-dryers-rush.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fixes a bug that caused a session error to be logged when using actions without sessions

packages/astro/src/actions/runtime/virtual/server.ts

@@ -300,13 +300,21 @@ export function getActionContext(context: APIContext): AstroActionContext {
 					}
 					throw e;
 				}
-				const {
-					props: _props,
-					getActionResult: _getActionResult,
-					callAction: _callAction,
-					redirect: _redirect,
-					...actionAPIContext
-				} = context;
+
+				const omitKeys = ['props', 'getActionResult', 'callAction', 'redirect'];
+
+				// Clones the context, preserving accessors and methods but omitting
+				// the properties that are not needed in the action handler.
+				const actionAPIContext = Object.create(
+					Object.getPrototypeOf(context),
+					Object.fromEntries(
+						Object.entries(Object.getOwnPropertyDescriptors(context))
+							.filter(([key]) =>
+								!omitKeys.includes(key)
+							)
+					)
+				);
+
 				Reflect.set(actionAPIContext, ACTION_API_CONTEXT_SYMBOL, true);
 				const handler = baseAction.bind(actionAPIContext satisfies ActionAPIContext);
 				return handler(input);