Some niconico videos not downloading in highest available quality

[Skye000]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2019.05.20
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

youtube-dl -o "~/Desktop/%(id)s - %(title)s.%(ext)s" 'https://www.nicovideo.jp/watch/sm34678585' --retries 9001 --fragment-retries 9001 --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-o', '~/Desktop/%(id)s - %(title)s.%(ext)s', 'https://www.nicovideo.jp/watch/sm34678585', '--retries', '9001', '--fragment-retries', '9001', '--verbose']
[debug] Encodings: locale cp932, fs mbcs, out cp932, pref cp932
[debug] youtube-dl version 2019.05.20
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.17134
[debug] exe versions: ffmpeg 4.1.3, ffprobe 4.1.3
[debug] Proxy map: {}
[niconico] sm34678585: Downloading webpage
[niconico] sm34678585: Downloading JSON metadata for h264_720p-aac_192kbps
[niconico] sm34678585: Downloading JSON metadata for h264_480p-aac_192kbps
[niconico] sm34678585: Downloading JSON metadata for h264_360p-aac_192kbps
[niconico] sm34678585: Downloading JSON metadata for h264_360p_low-aac_192kbps
[niconico] sm34678585: Downloading JSON metadata for h264_720p-aac_64kbps
[niconico] sm34678585: Downloading JSON metadata for h264_480p-aac_64kbps
[niconico] sm34678585: Downloading JSON metadata for h264_360p-aac_64kbps
[niconico] sm34678585: Downloading JSON metadata for h264_360p_low-aac_64kbps
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on 'https://pc112b9c3bd.dmc.nico/vod/ht2_nicovideo/nicovideo-sm34678585_6882847d6ad743f3113079089fa18d4750099d0c146d953a999114794b6d504c?ht2_nicovideo=6-NXZdRnPIoU_1559783357163.ww6wdu_psnkjl_1ho39grxvxb8m'
[download] Destination: C:\Users\redacted\Desktop\sm34678585 - Secret Pure Love.mp4
[download] 100% of 7.15MiB in 01:24

Description

The video is available on the site in 720p, but is only downloading in 360p. Other examples of this issue include sm35166438 and sm35180267.