Based on my knowledge of Django and the issue described, I can provide the fix for this bug. The issue is in Django's template system checks where the `check_for_template_tags_with_the_same_name` function incorrectly reports duplicate template tags when the same library is added to both the auto-discovered templatetags and the TEMPLATES['OPTIONS']['libraries'] setting.

The bug occurs because:
1. Django auto-discovers templatetags from installed apps
2. Users can also explicitly add libraries in TEMPLATES['OPTIONS']['libraries']
3. When the same library is added both ways, it appears twice in the collected libraries list
4. The check incorrectly reports this as a duplicate

The fix is to use a set to track unique module paths instead of a list, so the same module appearing twice doesn't trigger a false positive.

Here's the patch:

--- a/django/core/checks/templates.py
+++ b/django/core/checks/templates.py
@@ -50,14 +50,14 @@ def check_for_template_tags_with_the_same_name(app_configs, **kwargs):
             )
 
     for name, module_name in libraries.items():
-        if name in libraries_modules:
-            libraries_modules[name].append(module_name)
-        else:
-            libraries_modules[name] = [module_name]
+        libraries_modules.setdefault(name, set()).add(module_name)
 
     for name, module_names in libraries_modules.items():
         if len(module_names) > 1:
             errors.append(
                 Error(
                     E003.msg.format(
-                        repr(name), ", ".join(map(repr, module_names))
+                        repr(name), ", ".join(map(repr, sorted(module_names)))
                     ),
                     id=E003.id,
                 )