diff --git a/packages/opencode/src/reference.ts b/packages/opencode/src/reference.ts
index e602e25b36b..cb9df487ea2 100644
--- a/packages/opencode/src/reference.ts
+++ b/packages/opencode/src/reference.ts
@@ -9,7 +9,7 @@ import { ProjectReference } from "@opencode-ai/core/project-reference"
 import { ConfigReference } from "@opencode-ai/core/config/reference"
 import { RepositoryCache } from "@opencode-ai/core/repository-cache"
 import { AbsolutePath } from "@opencode-ai/core/schema"
-import { Context, Effect, Layer, Schema } from "effect"
+import { Context, Effect, Layer, Schema, Scope } from "effect"
 
 export type Resolved = ProjectReference.Resolved
 
@@ -51,6 +51,7 @@ export const layer = Layer.effect(
   Service,
   Effect.gen(function* () {
     const config = yield* Config.Service
+    const scope = yield* Scope.Scope
     const state = yield* InstanceState.make(
       Effect.fn("Reference.state")(function* (ctx) {
         const { Config: ConfigV2 } = yield* Effect.promise(() => import("@opencode-ai/core/config"))
@@ -93,6 +94,8 @@ export const layer = Layer.effect(
     return Service.of({
       init: Effect.fn("Reference.init")(function* () {
         yield* InstanceState.get(state)
+        // Own the cached warmup from the long-lived legacy scope before the core layer's scheduled fork can claim it.
+        yield* ensure().pipe(Effect.forkIn(scope, { startImmediately: true }), Effect.asVoid)
       }),
       list: Effect.fn("Reference.list")(function* () {
         return yield* InstanceState.useEffect(state, (service) => service.list())
diff --git a/packages/opencode/test/reference/reference.test.ts b/packages/opencode/test/reference/reference.test.ts
index 4cc5eb4506e..907d7d1a3f8 100644
--- a/packages/opencode/test/reference/reference.test.ts
+++ b/packages/opencode/test/reference/reference.test.ts
@@ -1,5 +1,6 @@
 import { afterEach, describe, expect } from "bun:test"
 import path from "path"
+import { pathToFileURL } from "url"
 import { Effect, Layer } from "effect"
 import { FSUtil } from "@opencode-ai/core/fs-util"
 import { CrossSpawnSpawner } from "@opencode-ai/core/cross-spawn-spawner"
@@ -202,7 +203,9 @@ describe("reference", () => {
             const resolved = yield* reference.get("docs")
             expect(resolved?.kind).toBe("git")
             if (resolved?.kind === "git") {
-              expect(resolved.reference.remote).toBe(`file://${remoteRoot}/opencode-reference-init/repo.git`)
+              expect(resolved.reference.remote).toBe(
+                new URL("opencode-reference-init/repo.git", pathToFileURL(remoteRoot + path.sep)).href,
+              )
             }
           }),
         {