Navigate from /a/[id] to /b/[id] fix

runtime/src/app/app.ts

@@ -289,7 +289,7 @@ export async function hydrate_target(target: Target): Promise<{
 			const j = l++;
 
 			const segment = segments[i];
-			if (!session_dirty && current_branch[i] && current_branch[i].segment === segment) return current_branch[i];
+			if (!session_dirty && current_branch[i] && current_branch[i].segment === segment && current_branch[i].part === part.i) return current_branch[i];
 
 			const { default: component, preload } = await load_component(components[part.i]);
 
@@ -306,7 +306,7 @@ export async function hydrate_target(target: Target): Promise<{
 				preloaded = initial_data.preloaded[i + 1];
 			}
 
-			return (props[`level${j}`] = { component, props: preloaded, segment });
+			return (props[`level${j}`] = { component, props: preloaded, segment, part: part.i });
 		}));
 	} catch (error) {
 		props.error = error;

test/apps/basics/src/routes/dirs/bar/[a].svelte

@@ -0,0 +1,3 @@
+<h1>A page</h1>
+
+<a href="dirs/foo/xyz">same segment</a>

test/apps/basics/src/routes/dirs/foo/[b].svelte

@@ -0,0 +1 @@
+<h1>B page</h1>

test/apps/basics/test.ts

@@ -282,6 +282,17 @@ describe('basics', function() {
 		assert.equal(await title(), 'bar');
 	});
 
+	it('navigates between dynamic routes with same segments', async () => {
+		await page.goto(`${base}/dirs/bar/xyz`);
+		await start();
+
+		assert.equal(await title(), 'A page');
+
+		await page.click('[href="dirs/foo/xyz"]');
+		await wait(50);
+		assert.equal(await title(), 'B page');
+	});
+
 	it('runs server route handlers before page handlers, if they match', async () => {
 		const json = await get(`${base}/middleware`, {
 			headers: {