ImportError: Module import failed for Tag Category

ERPNext: v12.1.8 (version-12)
Frappe Framework: v12.0.17 (version-12)

When I try to open the list view for tag categories i receive the following error:

Traceback (most recent call last):
  File "/home/frappe/frappe-bench/apps/frappe/frappe/app.py", line 60, in application
    response = frappe.api.handle()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/api.py", line 55, in handle
    return frappe.handler.handle()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/handler.py", line 22, in handle
    data = execute_cmd(cmd)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/handler.py", line 61, in execute_cmd
    return frappe.call(method, **frappe.form_dict)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/__init__.py", line 1038, in call
    return fn(*args, **newargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/desk/form/load.py", line 65, in getdoctype
    docs = get_meta_bundle(parent_dt)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/desk/form/load.py", line 79, in get_meta_bundle
    bundle = [frappe.desk.form.meta.get_meta(doctype)]
  File "/home/frappe/frappe-bench/apps/frappe/frappe/desk/form/meta.py", line 29, in get_meta
    meta = FormMeta(doctype)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/desk/form/meta.py", line 39, in __init__
    self.load_assets()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/desk/form/meta.py", line 53, in load_assets
    self.load_templates()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/desk/form/meta.py", line 179, in load_templates
    module = load_doctype_module(self.name)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/modules/utils.py", line 206, in load_doctype_module
    raise ImportError('Module import failed for {0} ({1})'.format(doctype, module_name + ' Error: ' + str(e)))
ImportError: Module import failed for Tag Category (frappe.core.doctype.tag_category.tag_category Error: No module named tag_category.tag_category)

Is it a bug or a mismatch in my setup?