'%(channel)s' is coming as NA instead of channel name

[GorvGoyl]

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2021.03.25
• I've checked that all provided URLs are alive and playable in a browser
• I've searched the bugtracker for similar bug reports including closed ones
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've read bugs section in FAQ

Verbose log

$ .\youtube-dl -v -o '%(channel)s' https://www.youtube.com/watch?v=Vjf09Y51PaM
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '-o', '%(channel)s', 'https://www.youtube.com/watch?v=Vjf09Y51PaM']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2021.03.25
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.19041
[debug] exe versions: none
[debug] Proxy map: {}
[youtube] Vjf09Y51PaM: Downloading webpage
[debug] Default format spec: best/bestvideo+bestaudio
[debug] Invoking downloader on 'https://r2---sn-ci5gup-qxaee.googlevideo.com/videoplayback?expire=1616889010&ei=UnBfYNr2E5PsjuMP1ZmroAQ&ip=117.99.178.121&id=o-AKM4GjH3456ijOSAYoObhhM6KouBktecFRF6Rlshb1_t&itag=18&source=youtube&requiressl=yes&mh=NW&mm=31%2C26&mn=sn-ci5gup-qxaee%2Csn-cvh7knle&ms=au%2Conr&mv=m&mvi=2&pl=20&gcr=in&initcwndbps=1007500&vprv=1&mime=video%2Fmp4&ns=DMiclyOW-QOIknCyapX-hGUF&gir=yes&clen=11000019&ratebypass=yes&dur=392.045&lmt=1568831289261741&mt=1616867090&fvip=2&fexp=24001373%2C24007246&beids=9466586&c=WEB&txp=2311222&n=N5Sdlo5hgfKDrjS2NzYZf&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cgcr%2Cvprv%2Cmime%2Cns%2Cgir%2Cclen%2Cratebypass%2Cdur%2Clmt&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRgIhAKQ1xG2BgQ3W3_L9K8NjYG5cMl5biT75nDfq9a9I-MnnAiEA14QT2IHZmHOb8Ho6p0yUhPd4YQdABE9lE75UZZk69Fs%3D&sig=AOq0QJ8wRQIgZDSAo5LjuHCYUxbaqxuotO4DaZdCfSCkNDGR5wkZHHQCIQC6M3GnHQOWXFP2aQleLJSOKoJZeF80WFmIh3Whe2a7sw=='
[download] Destination: NA
[download] 100% of 10.49MiB in 00:01

Description

I can't get the channel name, instead I get NA, though channel_id is working fine.
How to reproduce:
RUN:

.\youtube-dl -v -o '%(channel)s' https://www.youtube.com/watch?v=Vjf09Y51PaM

Actual output file: NA
Expected output file: FluxPavilion

[GorvGoyl]

woah that's a rapid fix. thanks.