Repository: yt-dlp
Issue: [Niconico] Comment count and real amount of comments downloaded do not match
Labels: site-bug,triage

### DO NOT REMOVE OR SKIP THE ISSUE TEMPLATE

- [X] I understand that I will be **blocked** if I *intentionally* remove or skip any mandatory\* field

### Checklist

- [X] I'm asking a question and **not** reporting a bug or requesting a feature
- [X] I've looked through the [README](https://github.com/yt-dlp/yt-dlp#readme)
- [X] I've verified that I have **updated yt-dlp to nightly or master** ([update instructions](https://github.com/yt-dlp/yt-dlp#update-channels))
- [X] I've searched [known issues](https://github.com/yt-dlp/yt-dlp/issues/3766) and the [bugtracker](https://github.com/yt-dlp/yt-dlp/issues?q=) for similar questions **including closed ones**. DO NOT post duplicates
- [X] I've read the [guidelines for opening an issue](https://github.com/yt-dlp/yt-dlp/blob/master/CONTRIBUTING.md#opening-an-issue)

### Please make sure the question is worded well enough to be understood

In this example (https://www.nicovideo.jp/watch/sm11188599), the amount of comments shown both on the website and when I ran yt-dlp with `--print comment_count` were 6421, but the after downloading with `--write-sub --add-header accept-language:ja` there were only 607 entries listed in the comment.json file
[【勝手にPV】きみにごめんね【祝GUMI誕＆1周年】 [sm11188599].comments.json](https://github.com/user-attachments/files/17715488/PV.GUMI.1.sm11188599.comments.json)
Why is this happening and is yt-dlp capable of fixing it?


### Provide verbose output that clearly demonstrates the problem

- [X] Run **your** yt-dlp command with **-vU** flag added (`yt-dlp -vU <your command line>`)
- [ ] If using API, add `'verbose': True` to `YoutubeDL` params instead
- [X] Copy the WHOLE output (starting with `[debug] Command-line config`) and insert it below

### Complete Verbose Output

```shell
[debug] Command-line config: ['-P', 'E:\\DIVINE REALM\\KIEN\\Video\\NND', '-vU', '--write-subs', '--no-download', '--add-header', 'accept-language:ja', 'https://www.nicovideo.jp/watch/sm11188599']
[debug] Encodings: locale cp932, fs utf-8, pref cp932, out utf-8, error utf-8, screen utf-8
[debug] yt-dlp version nightly@2024.11.11.232805 from yt-dlp/yt-dlp-nightly-builds [a9f85670d] (win_exe)
[debug] Python 3.10.11 (CPython AMD64 64bit) - Windows-10-10.0.19041-SP0 (OpenSSL 1.1.1t  7 Feb 2023)
[debug] exe versions: ffmpeg 7.0.1-full_build-www.gyan.dev (setts), ffprobe 7.0.1-full_build-www.gyan.dev
[debug] Optional libraries: Cryptodome-3.21.0, brotli-1.1.0, certifi-2024.08.30, curl_cffi-0.5.10, mutagen-1.47.0, requests-2.32.3, sqlite3-3.40.1, urllib3-2.2.3, websockets-13.1
[debug] Proxy map: {}
[debug] Request Handlers: urllib, requests, websockets, curl_cffi
[debug] Loaded 1838 extractors
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp-nightly-builds/releases/latest
Latest version: nightly@2024.11.11.232805 from yt-dlp/yt-dlp-nightly-builds
yt-dlp is up to date (nightly@2024.11.11.232805 from yt-dlp/yt-dlp-nightly-builds)
[niconico] Extracting URL: https://www.nicovideo.jp/watch/sm11188599
[niconico] sm11188599: Downloading webpage
[niconico] sm11188599: Downloading JSON metadata
[niconico] sm11188599: Downloading m3u8 information
[niconico] sm11188599: Downloading comments
[info] sm11188599: Downloading subtitles: comments
[debug] Formats sorted by: hasvid, ie_pref, lang, quality, res, fps, hdr:12(7), vcodec, channels, acodec, size, br, asr, proto, vext, aext, hasaud, source, id
[debug] Default format spec: bestvideo*+bestaudio/best
[info] sm11188599: Downloading 1 format(s): video-302+audio-aac-128kbps
Deleting existing file E:\DIVINE REALM\KIEN\Video\NND\【勝手にPV】きみにごめんね【祝GUMI誕＆1周年】 [sm11188599].comments.json
[info] Writing video subtitles to: E:\DIVINE REALM\KIEN\Video\NND\【勝手にPV】きみにごめんね【祝GUMI誕＆1周年】 [sm11188599].comments.json
```