Unable to parse Obsidian template with date placeholder field

[pursvir]

Trace:

Traceback (most recent call last):
  File "<python-input-0>", line 3, in <module>
    front_matter = Frontmatter.read_file("/home/user/test.md")
  File "/home/user/.local/lib/python3.14/site-packages/frontmatter/__init__.py", line 18, in read_file
    return cls.read(file_contents)
           ~~~~~~~~^^^^^^^^^^^^^^^
  File "/home/user/.local/lib/python3.14/site-packages/frontmatter/__init__.py", line 37, in read
    "attributes": yaml.load(fmatter, Loader=yaml.FullLoader),
                  ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.local/lib/python3.14/site-packages/yaml/__init__.py", line 114, in load
    return loader.get_single_data()
           ~~~~~~~~~~~~~~~~~~~~~~^^
  File "/home/user/.local/lib/python3.14/site-packages/yaml/constructor.py", line 43, in get_single_data
    return self.construct_document(node)
           ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/home/user/.local/lib/python3.14/site-packages/yaml/constructor.py", line 52, in construct_document
    for dummy in generator:
                 ^^^^^^^^^
  File "/home/user/.local/lib/python3.14/site-packages/yaml/constructor.py", line 404, in construct_yaml_map
    value = self.construct_mapping(node)
  File "/home/user/.local/lib/python3.14/site-packages/yaml/constructor.py", line 210, in construct_mapping
    return super().construct_mapping(node, deep=deep)
           ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/home/user/.local/lib/python3.14/site-packages/yaml/constructor.py", line 133, in construct_mapping
    raise ConstructorError("while constructing a mapping", node.start_mark,
            "found unhashable key", key_node.start_mark)
yaml.constructor.ConstructorError: while constructing a mapping
  in "<unicode string>", line 2, column 8:
    Added: {{date:YYYY-MM-DD}}
           ^
found unhashable key
  in "<unicode string>", line 2, column 9:
    Added: {{date:YYYY-MM-DD}}
            ^

Code:

from frontmatter import Frontmatter

front_matter = Frontmatter.read_file("/home/user/test.md")

File content:

---
Added: {{date:YYYY-MM-DD}}
---

Sample text here.