diff --git a/.changeset/honest-dots-jump.md b/.changeset/honest-dots-jump.md
new file mode 100644
index 000000000000..9ae5d7f1c99f
--- /dev/null
+++ b/.changeset/honest-dots-jump.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fixes conflict between server islands and on-demand dynamic routes in the form of `/[...rest]` or `/[paramA]/[paramB]`.
diff --git a/packages/astro/e2e/fixtures/server-islands/src/pages/[conflicting]/[dynamicRoute].astro b/packages/astro/e2e/fixtures/server-islands/src/pages/[conflicting]/[dynamicRoute].astro
new file mode 100644
index 000000000000..d5ac0379ec76
--- /dev/null
+++ b/packages/astro/e2e/fixtures/server-islands/src/pages/[conflicting]/[dynamicRoute].astro
@@ -0,0 +1,14 @@
+---
+export const prerender = false;
+---
+
+
+
+ Conflicting route
+
+
+ This route would conflict with the route generated for server islands.
+
+ This file is here so the tests break if that happens.
+
+
diff --git a/packages/astro/src/core/server-islands/endpoint.ts b/packages/astro/src/core/server-islands/endpoint.ts
index 368a1b9b19ac..e6168b6e0ac6 100644
--- a/packages/astro/src/core/server-islands/endpoint.ts
+++ b/packages/astro/src/core/server-islands/endpoint.ts
@@ -44,7 +44,7 @@ export function ensureServerIslandRoute(config: ConfigFields, routeManifest: Man
return;
}
- routeManifest.routes.push(getServerIslandRouteData(config));
+ routeManifest.routes.unshift(getServerIslandRouteData(config));
}
type RenderOptions = {