diff --git a/apps/xtream-mock-server/src/app/project-config.spec.ts b/apps/xtream-mock-server/src/app/project-config.spec.ts
index 9c1895228..740a1ee5c 100644
--- a/apps/xtream-mock-server/src/app/project-config.spec.ts
+++ b/apps/xtream-mock-server/src/app/project-config.spec.ts
@@ -87,3 +87,99 @@ describe('Playwright mock-server launch', () => {
         }
     );
 });
+
+describe('Nx E2E task dependencies', () => {
+    type Dependency =
+        | string
+        | {
+              projects?: string | string[];
+              dependencies?: boolean;
+              target?: string;
+          };
+    type TargetConfig = {
+        dependsOn?: Dependency[];
+        continuous?: boolean;
+        filter?: { projects?: string[] };
+    };
+    type ProjectJson = { targets: Record<string, TargetConfig> };
+    const readJson = <T>(path: string) =>
+        JSON.parse(readFileSync(join(process.cwd(), path), 'utf8')) as T;
+    const nxJson = readJson<{
+        targetDefaults: Record<string, TargetConfig | TargetConfig[]>;
+    }>('nx.json');
+    const appNames = readdirSync(join(process.cwd(), 'apps'));
+    const e2eProjectFiles = appNames
+        .filter((name) => name.endsWith('-e2e'))
+        .map((name) => `apps/${name}/project.json`);
+    // The E2E projects list the mocks as implicit dependencies, so a `^serve`
+    // dependency schedules the mock serve tasks as well.
+    const mockContinuousTargets = new Set(
+        appNames
+            .filter((name) => name.endsWith('-mock-server'))
+            .flatMap((name) =>
+                Object.entries(
+                    readJson<ProjectJson>(`apps/${name}/project.json`).targets
+                )
+                    .filter(([, target]) => target.continuous)
+                    .map(([targetName]) => targetName)
+            )
+    );
+    const dependsOnMock = (dependency: Dependency) =>
+        typeof dependency === 'string'
+            ? dependency.includes('-mock-server:') ||
+              (dependency.startsWith('^') &&
+                  mockContinuousTargets.has(dependency.slice(1)))
+            : [dependency.projects ?? []]
+                  .flat()
+                  .some((project) => project.includes('-mock-server')) ||
+              (dependency.dependencies === true &&
+                  mockContinuousTargets.has(dependency.target ?? ''));
+    const perFileDefaultFor = (project: string) =>
+        [nxJson.targetDefaults['e2e-ci--src/*.e2e.ts'] ?? []]
+            .flat()
+            .find((entry) => entry.filter?.projects?.includes(project));
+
+    // The Playwright configs start the mocks themselves, so @nx/playwright
+    // infers their E2E targets as non-parallel, and Nx refuses to run a
+    // non-parallel task that depends on a continuous `serve` task.
+    it('never makes an E2E target depend on a mock-server task', () => {
+        const e2eDefaults = Object.entries(nxJson.targetDefaults)
+            .filter(([targetName]) => targetName.startsWith('e2e'))
+            .flatMap(([targetName, config]) =>
+                [config].flat().map((entry) => ({
+                    source: `nx.json ${targetName}`,
+                    config: entry,
+                }))
+            );
+        const e2eProjectTargets = e2eProjectFiles.flatMap((path) =>
+            Object.entries(readJson<ProjectJson>(path).targets).map(
+                ([targetName, config]) => ({
+                    source: `${path} ${targetName}`,
+                    config,
+                })
+            )
+        );
+        const mockDependencies = [...e2eDefaults, ...e2eProjectTargets]
+            .map(({ source, config }) => ({
+                source,
+                dependencies: (config.dependsOn ?? []).filter(dependsOnMock),
+            }))
+            .filter(({ dependencies }) => dependencies.length > 0);
+
+        expect(e2eProjectFiles).toEqual(
+            expect.arrayContaining([
+                'apps/electron-backend-e2e/project.json',
+                'apps/web-e2e/project.json',
+            ])
+        );
+        expect([...mockContinuousTargets]).toContain('serve');
+        expect(mockDependencies).toEqual([]);
+    });
+
+    it('builds the Electron app only before Electron per-file E2E targets', () => {
+        expect(perFileDefaultFor('electron-backend-e2e')?.dependsOn).toEqual([
+            { projects: ['electron-backend'], target: 'build-e2e' },
+        ]);
+        expect(perFileDefaultFor('web-e2e')?.dependsOn).toEqual([]);
+    });
+});
diff --git a/docs/architecture/xtream-mock-server.md b/docs/architecture/xtream-mock-server.md
index 571c2f461..a82e1618f 100644
--- a/docs/architecture/xtream-mock-server.md
+++ b/docs/architecture/xtream-mock-server.md
@@ -579,7 +579,11 @@ for the serve target's `--tsconfig` flag and is required for the `@iptvnator/*`
 path aliases. `project-config.spec.ts` pins which configs start which mock,
 and fails if any of them launches a mock through Nx or a new config starts one
 without being listed there. The `serve` targets remain the entry point
-for starting a mock by hand. The web-e2e `web-backend` entry uses the same
+for starting a mock by hand, and no E2E target may depend on them: with no
+Nx-launched server, `@nx/playwright` infers the atomized `e2e-ci--*` targets
+as non-parallel, and Nx refuses to run a non-parallel task that depends on a
+continuous `serve` task. The same spec guards the `e2e*` entries of `nx.json`
+`targetDefaults` and every target in the `apps/*-e2e` `project.json` files. The web-e2e `web-backend` entry uses the same
 launch form; see [PWA web backend](pwa-self-hosted.md#web-backend).
 
 ### Request Interception
diff --git a/nx.json b/nx.json
index ff0a58753..2f36ffe99 100644
--- a/nx.json
+++ b/nx.json
@@ -68,18 +68,21 @@
             "dependsOn": ["^build"],
             "inputs": ["production", "^production"]
         },
-        "e2e-ci--src/*.e2e.ts": {
-            "dependsOn": [
-                {
-                    "projects": ["electron-backend"],
-                    "target": "build-e2e"
-                },
-                {
-                    "projects": ["stalker-mock-server", "xtream-mock-server"],
-                    "target": "serve"
-                }
-            ]
-        }
+        "e2e-ci--src/*.e2e.ts": [
+            {
+                "filter": { "projects": ["electron-backend-e2e"] },
+                "dependsOn": [
+                    {
+                        "projects": ["electron-backend"],
+                        "target": "build-e2e"
+                    }
+                ]
+            },
+            {
+                "filter": { "projects": ["web-e2e"] },
+                "dependsOn": []
+            }
+        ]
     },
     "plugins": [
         {