Trying to bob deinterlace using DGDecNV, getting mkv with only audio

[Selur]

I have no clue why Hybrid behaves the way it does you describe on your system.
At least the output in the input folder now contains the job creation:

• 2021-08-18@19_48_44_1710_01_audio
  extract the audio using:
  
  mkvextract tracks "G:\F1\DIGI Sport 4 HD - F1 Cursa Monaco 2021.07.28 20.44\3. Lance Stroll Original HD Interrupts and Hits The Barrier 2021 F1 Monaco GP.mkv" 1:"C:\Users\Alexa\AppData\Local\Temp\iId_1_aid_0_lang_ro_DELAY_-186ms_2021-08-18@19_44_09_4810_01.mp2"
• 2021-08-18@19_48_44_1710_02_index
  creates the Index file for DGIndexNV using:
  
  "D:\Program Files\Hybrid\32bit\avisynthPlugins\DGIndexNV.exe" -i "G:\F1\DIGI Sport 4 HD - F1 Cursa Monaco 2021.07.28 20.44\3. Lance Stroll Original HD Interrupts and Hits The Barrier 2021 F1 Monaco GP.mkv" -o "C:\Users\Alexa\AppData\Local\Temp\2021-08-18@19_48_44_1710.dgi" -h -e
• 2021-08-18@19_48_44_1710_03_create
  creates the Avisynth script:
  C:\Users\Alexa\AppData\Local\Temp\encodingTempSynthSkript_2021-08-18@19_44_09_4810.avs
  with the following content
  
  ClearAutoloadDirs()
SetFilterMTMode("DEFAULT_MT_MODE", MT_MULTI_INSTANCE)
LoadPlugin("D:\Program Files\Hybrid\32bit\avisynthPlugins\DGDecodeNV.dll")
# loading source: G:\F1\DIGI Sport 4 HD - F1 Cursa Monaco 2021.07.28 20.44\3. Lance Stroll Original HD Interrupts and Hits The Barrier 2021 F1 Monaco GP.mkv
# color sampling YV12@8, matrix: bt709, scantyp: top field first, luminance scale: limited
# deinterlace using DGDECNV
DGSource(dgi="C:\Users\Alexa\AppData\Local\Temp\2021-08-18@19_48_44_1710.dgi",use_top_field=true,deinterlace=2)
# current resolution: 1920x1080
# filtering
PreFetch(6)
# setting output fps to 50.000fps
AssumeFPS(50,1)
#  output: color sampling YV12@8, matrix: bt709, scantyp: progressive, luminance scale: limited
return last
• 2021-08-18@19_48_44_1710_04_video
  encode the audio using
  
  ffmpeg_32 -y -loglevel fatal -noautorotate -nostdin -threads 8 -i "C:\Users\Alexa\AppData\Local\Temp\encodingTempSynthSkript_2021-08-18@19_48_44_1710.avs" -an -sn -vf zscale=rangein=tv:range=tv -pix_fmt yuv420p -vsync 0 -f rawvideo - | x264 --preset veryfast --pass 1 --bitrate 15210 --profile high --level 4.2 --direct auto --b-adapt 0 --sync-lookahead 18 --qcomp 0.50 --rc-lookahead 40 --qpmax 51 --aq-mode 0 --sar 1:1 --non-deterministic --stats "C:\Users\Alexa\AppData\Local\Temp\3. Lance Stroll Original HD Interrupts and Hits The Barrier 2021 F1 Monaco GP1_2021-08-18@19_48_44_1710_04.stats" --demuxer raw --input-res 1920x1080 --input-csp i420 --input-range tv --input-depth 8 --fps 50/1 --output-depth 8 --output NUL -
• 2021-08-18@19_48_44_1710_05_create
  created xml for tags for mkv
  
• 2021-08-18@19_48_44_1710_06_muxing
  muxes audio and video using:
  
  mkvmerge --ui-language en -o "G:\F1\DIGI Sport 4 HD - F1 Cursa Monaco 2021.07.28 20.44\3. Lance Stroll Original HD Interrupts and Hits The Barrier 2021 F1 Monaco GP1.mkv" --global-tags "C:\Users\Alexa\AppData\Local\Temp\3. Lance Stroll Original HD Interrupts and Hits The Barrier 2021 F1 Monaco GP1_2021-08-18@19_48_44_1710__05.xml" --language 0:ro --default-track 0:yes --sync 0:-186 --forced-track 0:no -a 0 --compression -1:none --no-video --no-subtitles --no-chapters "C:\Users\Alexa\AppData\Local\Temp\iId_1_aid_0_lang_ro_DELAY_-186ms_2021-08-18@19_48_44_1710_01.mp2"
• 2021-08-18@19_48_44_1710_07_cleanUp
  deletes "C:\Users\Alexa\AppData\Local\Temp\3. Lance Stroll Original HD Interrupts and Hits The Barrier 2021 F1 Monaco GP1_2021-08-18@19_48_44_1710__05.xml"
  
• 2021-08-18@19_48_44_1710_08_cleanUp
  deletes "C:\Users\Alexa\AppData\Local\Temp\iId_1_aid_0_lang_ro_DELAY_-186ms_2021-08-18@19_48_44_1710_01.mp2"
  

Looking at the these calls I see the problem:
Your used "x264->Encoding mode->Specific filesize/bitrate (2pass - 1st pass)" which does not creat a video output file and is only meant to create a stats files.
-> This is not a bug in Hybrid, it does examply what you tell it to do.
Read the tool tip of the 'Encoding mode' properly and then either use "x264->Encoding mode->Specific filesize/bitrate (2pass)" for 2pass encoding or "x264->Encoding mode->constatn rate factor (1-pass)".

Cu Selur