Invalid character position -1 with flake8-annotations

[ketakopter]

Using flake8 with flake8-annotations plugin results in an invalid character position -1 in this simple snippet:

def myfun():
    # erg
    pass

The pylsp server returns the following response:

[jsonrpc] e[22:41:37.731] <-- textDocument/publishDiagnostics
{
  "jsonrpc": "2.0",
  "method": "textDocument/publishDiagnostics",
  "params": {
    "uri": "file:////tmp/hu.py",
    "diagnostics": [
      {
        "source": "flake8",
        "code": "ANN201",
        "range": {
          "start": {
            "line": 1,
            "character": -1
          },
          "end": {
            "line": 1,
            "character": 10
          }
        },
        "message": "ANN201 Missing return type annotation for public function",
        "severity": 2
      }
    ],
    "version": 126
  }
}

As you can see, the ANN201 error starts at character -1. I assume this is invalid, because my client (eglot in Emacs) complains about it.

The issue seems connected to the comment line. An empty line also has the same issue. A docstring line does not.

The python-lsp-server config that I'm using at Emacs:

;; (...)
  '((:pylsp . (:plugins (:mccabe (:enabled :json-false)
                                 :pycodestyle (:enabled :json-false)
                                 :pyflakes (:enabled :json-false)
                                 :flake8 (:enabled t)
                                 )
                        :configurationSources ["flake8"])))

As said, flake8 and flake8-annotations are being used.

Using flake8 directly from CLI doesn't show anything weird, only ANN201 is reported.

> flake8 hu.py
hu.py:2:0: ANN201 Missing return type annotation for public function

Versions:

python-lsp-jsonrpc 1.1.2
python-lsp-server 1.12.0
flake8 7.1.1
flake8-annotations 3.1.1

Honestly I don't know where the source of the problem is, if the LSP server or flake8-annotations or somewhere else.