[bilibili.tv] Incomplete acquisition of subtitle format

[ltsj]

DO NOT REMOVE OR SKIP THE ISSUE TEMPLATE

• I understand that I will be blocked if I intentionally remove or skip any mandatory* field

Checklist

• I'm reporting that a supported site is broken
• I've verified that I'm running yt-dlp version 2023.03.04 (update instructions) or later (specify commit)
• I've checked that all provided URLs are playable in a browser with the same IP and same login details
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched known issues and the bugtracker for similar issues including closed ones. DO NOT post duplicates
• I've read the guidelines for opening an issue
• I've read about sharing account credentials and I'm willing to share it if required

Region

Southeast Asia(Singapore and ...)

Provide a description that is worded well enough to be understood

https://api.bilibili.tv/intl/gateway/web/v2/subtitle?s_locale=en_US&platform=web&episode_id=12766944

The website has newly added ass subtitles, and video_subtitle contains subtitles in two formats: ass and srt.yt-dlp. It seems that what you get is under subtitles, which is not comprehensive.
as the picture shows

Provide verbose output that clearly demonstrates the problem

• 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
• Copy the WHOLE output (starting with [debug] Command-line config) and insert it below

Complete Verbose Output

yt-dlp https://www.bilibili.tv/en/play/2079519/12766944 --list-subs --cookies bilibili_dny.txt -vU
[debug] Command-line config: ['https://www.bilibili.tv/en/play/2079519/12766944', '--list-subs', '--cookies', 'bilibili_dny.txt', '-vU']
[debug] Encodings: locale UTF-8, fs utf-8, pref UTF-8, out utf-8, error utf-8, screen utf-8
[debug] yt-dlp version stable@2023.03.04 [392389b7d] (zip)
[debug] Python 3.8.10 (CPython aarch64 64bit) - Linux-5.15.0-1017-oracle-aarch64-with-glibc2.29 (OpenSSL 1.1.1f  31 Mar 2020, glibc 2.31)
[debug] exe versions: none
[debug] Optional libraries: Cryptodome-3.14.1, brotli-1.0.9, certifi-2019.11.28, mutagen-1.46.0, secretstorage-2.3.1, sqlite3-2.6.0, websockets-11.0.3
[debug] Proxy map: {}
[debug] Loaded 1786 extractors
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp/releases/latest
Available version: stable@2023.03.04, Current version: stable@2023.03.04
Current Build Hash: 91cad9f121c1f6f0a81b747415c46ecba0ff331ed38cc6433040b4ac7b6e15ca
yt-dlp is up to date (stable@2023.03.04)
[BiliIntl] Extracting URL: https://www.bilibili.tv/en/play/2079519/12766944
[BiliIntl] 12766944: Downloading JSON metadata
[BiliIntl] 12766944: Downloading webpage
[BiliIntl] 12766944: Downloading JSON metadata
[BiliIntl] 12766944: Downloading video formats
[BiliIntl] 12766944: Downloading subtitles list
[BiliIntl] 12766944: Downloading subtitles for English
WARNING: [BiliIntl] 12766944: Failed to parse JSON: Unexpected UTF-8 BOM (decode using utf-8-sig): line 1 column 1 (char 0)
[BiliIntl] 12766944: Downloading subtitles for ภาษาไทย
WARNING: [BiliIntl] 12766944: Failed to parse JSON: Unexpected UTF-8 BOM (decode using utf-8-sig): line 1 column 1 (char 0)
[BiliIntl] 12766944: Downloading subtitles for Tiếng Việt
[BiliIntl] 12766944: Downloading subtitles for Bahasa Indonesia
WARNING: [BiliIntl] 12766944: Failed to parse JSON: Unexpected UTF-8 BOM (decode using utf-8-sig): line 1 column 1 (char 0)
[BiliIntl] 12766944: Downloading subtitles for 中文（简体）
[debug] Formats sorted by: hasvid, ie_pref, lang, quality, res, fps, hdr:12(7), vcodec:vp9.2(10), channels, acodec, filesize, fs_approx, tbr, vbr, abr, asr, proto, vext, aext, hasaud, source, id
[info] Available subtitles for 12766944:
Language Formats
vi       srt
zh-Hans  srt