Incomplete copyright detection for regular name

[stefan6419846]

Description

Seemingly regular copyright holders are not detected correctly.

How To Reproduce

• wget https://raw.githubusercontent.com/arthurdejong/python-stdnum/52d316200c347b4f3d2b61a77ce746f3d28a3815/stdnum/eu/ecnumber.py
• scancode --copyright --json-pp out ecnumber.py

We get

    {
      "path": "ecnumber.py",
      "type": "file",
      "copyrights": [
        {
          "copyright": "Copyright (c) 2023 Daniel",
          "start_line": 3,
          "end_line": 3
        }
      ],
      "holders": [
        {
          "holder": "Daniel",
          "start_line": 3,
          "end_line": 3
        }
      ],
      "authors": [],
      "scan_errors": []
    }

instead of the full Copyright (c) 2023 Daniel Weber.

System configuration

• What OS are you running on? Linux
• What version of scancode-toolkit was used to generate the scan file? 32.5.0
• What installation method was used to install/run scancode? pip

[stefan6419846]

I am not sure if this is the same or if this should be a separate issue, but https://github.com/NaturalHistoryMuseum/pylibdmtx/blob/00a6e0691db6cd2951d5b4614a9825962f53a7ff/LICENSE.txt yields to incomplete detections as well.