Broken syntax highlighting for async generic arrow functions with multiline arguments

TS and JS Grammar Extension version: 0.0.53 / latest

Syntax highlighting breaks for async generic arrow functions, whose arguments span multiple lines. This is basically the same problem as #481 but with async keyword

Code

async <TData, TError extends string = string>(
  url: string,
  config?: AxiosRequestConfig,
): Promise<Result<TData, TError>> => {
  try {
    const { data } = await Axios.get<ServerResponse<TData, TError>>(
      url,
      config,
    )
    return Result.fromResponse(data)
  } catch (e) {
    return handleError<TData, TError>(e)
  }
}

It works fine when I either move type arguments to next line/remove async/move arguments to one line. In the first two cases, type arguments and normal arguments highlighting doesn't work though.

Just noticed GitHub highlighting breaks as well. Is it a grammar limitation?

Reproduce the highlighting failure with the async generic arrow-function example in the issue, then compare it with the referenced #481 case. Trace the TypeScript/JavaScript grammar behavior for multiline arguments and verify that the example and its stated variants highlight correctly.