Right ... I didn't notice this at first because the post-processing I do (when adding the second audio track) adds the tag.I also noticed this, ie. no language is set when downloading from NF. It is set in all videos I downloaded with 1150, but when I tried 1155 and now 1156, it is not set anymore. It does download the correct track, though.
Audio
ID : 2
Format : E-AC-3
Format/Info : Enhanced AC-3
Commercial name : Dolby Digital Plus
Codec ID : ec-3
Duration : 58 min 21 s
Source duration : 58 min 21 s
Bit rate mode : Constant
Bit rate : 640 kb/s
Channel(s) : 6 channels
Channel layout : L R C LFE Ls Rs
Sampling rate : 48.0 kHz
Frame rate : 31.250 FPS (1536 SPF)
Compression mode : Lossy
Stream size : 267 MiB (16%)
Source stream size : 267 MiB (16%)
Language : German
Service kind : Complete Main
Encoded date : UTC 2021-05-01 18:08:08
Tagged date : UTC 2021-05-01 18:08:08
Audio
ID : 2
Format : E-AC-3
Format/Info : Enhanced AC-3
Commercial name : Dolby Digital Plus
Codec ID : ec-3
Duration : 48 min 23 s
Bit rate mode : Constant
Bit rate : 640 kb/s
Channel(s) : 6 channels
Channel layout : L R C LFE Ls Rs
Sampling rate : 48.0 kHz
Frame rate : 31.250 FPS (1536 SPF)
Compression mode : Lossy
Stream size : 221 MiB (24%)
Service kind : Complete Main
Encoded date : UTC 2021-07-16 09:25:58
Tagged date : UTC 2021-07-16 09:25:58
That I cannot confirm ... Subtitles are fine, at least on this specific downloadThis tag is missing in NF-subtitles too.