diff --git a/gitnexus/src/config/ignore-service.ts b/gitnexus/src/config/ignore-service.ts
index a5d0e05bb..163998a8e 100644
--- a/gitnexus/src/config/ignore-service.ts
+++ b/gitnexus/src/config/ignore-service.ts
@@ -466,9 +466,9 @@ export const createIgnoreFilter = async (repoPath: string, options?: IgnoreOptio
 
   return {
     ignored(p: Path): boolean {
-      // path-scurry's Path.relative() returns POSIX paths on all platforms,
-      // which is what the `ignore` package expects. No explicit normalization needed.
-      const rel = p.relative();
+      // The `ignore` package expects POSIX separators; path-scurry can surface
+      // native separators on Windows when called through glob.
+      const rel = p.relative().replace(/\\/g, '/');
       if (!rel) return false;
       // User's .gitnexusignore negation takes precedence over hardcoded
       // rules (#771). If any ancestor or the path itself was explicitly
@@ -488,7 +488,7 @@ export const createIgnoreFilter = async (repoPath: string, options?: IgnoreOptio
       // glob's `dot: false` option in filesystem-walker.ts. The hardcoded
       // list check below is defense-in-depth — do not remove `dot: false`
       // assuming this covers it.
-      const rel = p.relative();
+      const rel = p.relative().replace(/\\/g, '/');
       // User's .gitnexusignore negation takes precedence (#771) — if the
       // user explicitly unignored this directory or any ancestor via a
       // !pattern rule, allow descent even if the directory name is in
diff --git a/gitnexus/test/integration/filesystem-walker.test.ts b/gitnexus/test/integration/filesystem-walker.test.ts
index 8f934573c..031f446dd 100644
--- a/gitnexus/test/integration/filesystem-walker.test.ts
+++ b/gitnexus/test/integration/filesystem-walker.test.ts
@@ -219,6 +219,73 @@ describe('filesystem-walker', () => {
     });
   });
 
+  describe('.gitnexusignore negation of hardcoded directories', () => {
+    let partsDir: string;
+
+    beforeAll(async () => {
+      partsDir = await fs.mkdtemp(path.join(os.tmpdir(), 'gn-walker-parts-'));
+
+      await fs.mkdir(path.join(partsDir, 'parts', 'src', 'main', 'java', 'com', 'example'), {
+        recursive: true,
+      });
+      await fs.mkdir(
+        path.join(
+          partsDir,
+          'admin',
+          'src',
+          'main',
+          'java',
+          'com',
+          'example',
+          'controller',
+          'parts',
+        ),
+        { recursive: true },
+      );
+      await fs.mkdir(path.join(partsDir, 'node_modules', 'pkg'), { recursive: true });
+
+      await fs.writeFile(path.join(partsDir, '.gitnexusignore'), '!parts/\n');
+      await fs.writeFile(
+        path.join(partsDir, 'parts', 'src', 'main', 'java', 'com', 'example', 'Part.java'),
+        'package com.example; class Part {}',
+      );
+      await fs.writeFile(
+        path.join(
+          partsDir,
+          'admin',
+          'src',
+          'main',
+          'java',
+          'com',
+          'example',
+          'controller',
+          'parts',
+          'PartsController.java',
+        ),
+        'package com.example.controller.parts; class PartsController {}',
+      );
+      await fs.writeFile(
+        path.join(partsDir, 'node_modules', 'pkg', 'index.js'),
+        'module.exports = {}',
+      );
+    });
+
+    afterAll(async () => {
+      await fs.rm(partsDir, { recursive: true, force: true });
+    });
+
+    it('traverses top-level and nested parts directories when explicitly unignored (#2673)', async () => {
+      const files = await walkRepositoryPaths(partsDir);
+      const paths = files.map((f) => f.path.replace(/\\/g, '/'));
+
+      expect(paths).toContain('parts/src/main/java/com/example/Part.java');
+      expect(paths).toContain(
+        'admin/src/main/java/com/example/controller/parts/PartsController.java',
+      );
+      expect(paths.every((p) => !p.includes('node_modules/'))).toBe(true);
+    });
+  });
+
   describe('combined .gitignore + .gitnexusignore', () => {
     let combinedDir: string;
 
diff --git a/gitnexus/test/unit/ignore-service.test.ts b/gitnexus/test/unit/ignore-service.test.ts
index 23cb9abbc..42e1986df 100644
--- a/gitnexus/test/unit/ignore-service.test.ts
+++ b/gitnexus/test/unit/ignore-service.test.ts
@@ -335,6 +335,22 @@ describe('.gitnexusignore negation overrides hardcoded DEFAULT_IGNORE_LIST (#771
     expect(filter.ignored(mkPath('node_modules/express/index.js'))).toBe(false);
   });
 
+  it('`!parts/` unlocks Java modules and nested parts directories (#2673)', async () => {
+    await fs.writeFile(path.join(tmpDir, '.gitnexusignore'), '!parts/\n');
+    const filter = await createIgnoreFilter(tmpDir);
+
+    expect(filter.childrenIgnored(mkPath('parts'))).toBe(false);
+    expect(filter.ignored(mkPath('parts/src/main/java/com/example/Part.java'))).toBe(false);
+    expect(filter.childrenIgnored(mkPath('admin/src/main/java/com/example/controller/parts'))).toBe(
+      false,
+    );
+    expect(
+      filter.ignored(
+        mkPath('admin/src/main/java/com/example/controller/parts/PartsController.java'),
+      ),
+    ).toBe(false);
+  });
+
   it('negation of one hardcoded entry does not leak to others', async () => {
     await fs.writeFile(path.join(tmpDir, '.gitnexusignore'), '!__tests__/\n');
     const filter = await createIgnoreFilter(tmpDir);