Tailor creates invalid BUILD file for python_requirements

[kaos]

Describe the bug

$ ./pants tailor
Created 3rdparty/BUILD:
  - Add macro python_requirements
$ ./pants run src/pr:main
11:31:40.88 [ERROR] 1 Exception encountered:

  MappingError: Failed to parse ./3rdparty/BUILD:
__call__() got an unexpected keyword argument 'name'

$ tree
.
├── 3rdparty
│   ├── BUILD
│   └── requirements.txt
├── README.md
├── pants
├── pants.toml
└── src
    └── pr
        ├── BUILD
        └── main.py

3 directories, 9 files
$ cat 3rdparty/BUILD 
python_requirements(
    name="requirements.txt",
)

Pants version
2.9.0rc2

OS
Mac

Additional info

# pants.toml
[GLOBAL]
pants_version = "2.9.0rc2"
backend_packages = [
  "pants.backend.python",
  "pants.backend.experimental.python.lint.autoflake",
  "pants.backend.python.lint.black",
  "pants.backend.python.lint.docformatter",
  "pants.backend.python.lint.flake8",
  "pants.backend.python.lint.isort",
  "pants.backend.python.typecheck.mypy",
]


[anonymous-telemetry]
enabled = true
repo_id = "xx"

[kaos]

For the record. Changing name="requirements.txt" to source="requirements.txt" solves it.