Logitech C920 not working without YUV flag for mjpg_streamer on the Raspberry Pi 4

Camera model
046d:082d Logitech, Inc. HD Pro Webcam C920

What is the problem?
mjpg-streamer seems to need to run with the YUV flag despite being listed as a mjpeg compatible camera https://github.com/OctoPrint/OctoPrint/wiki/Webcams-known-to-work. Without the flag, the webcam script (shared below) errors out. While its not a huge issue and would be working with the YUV flag, I would like to find out why is a mjpeg compatible camera not working

What did you already try to solve it?
Tried to turn on/off the flag, tried to fiddle about v4l2-ctl settings to check for pixel format. Am I missing something here? Do I need to set the device pixel format/video input? (tried as shown here: http://trac.gateworks.com/wiki/linux/v4l2, but it defaults to mjpeg), as seen here:

pi@octopi4:/etc/init.d $ v4l2-ctl --device /dev/video0 --all
Driver Info:
        Driver name      : uvcvideo
        Card type        : HD Pro Webcam C920
        Bus info         : usb-0000:01: 00.0-1.1
        Driver version   : 4.19.75
        Capabilities     : 0x84a00001
                Video Capture
                Metadata Capture
                Streaming
                Extended Pix Format
                Device Capabilities
        Device Caps      : 0x04200001
                Video Capture
                Streaming
                Extended Pix Format
Media Driver Info:
        Driver name      : uvcvideo
        Model            : HD Pro Webcam C920
        Serial           : BFFA86DF
        Bus info         : 1.1
        Media version    : 4.19.75
        Hardware revision: 0x00000011 (17)
        Driver version   : 4.19.75
Interface Info:
        ID               : 0x03000002
        Type             : V4L Video
Entity Info:
        ID               : 0x00000001 (1)
        Name             : HD Pro Webcam C920
        Function         : V4L2 I/O
        Flags         : default
        Pad 0x01000007   : 0: Sink
          Link 0x0200001f: from remote pad 0x100000a of entity 'Processing 3': Data, Enabled, Immutable
Priority: 2
Video input : 0 (Camera 1: ok)
Format Video Capture:
        Width/Height      : 1920/1080
        Pixel Format      : 'MJPG' (Motion-JPEG)
        Field             : None
        Bytes per Line    : 0
        Size Image        : 4147200
        Colorspace        : sRGB
        Transfer Function : Default (maps to sRGB)
        YCbCr/HSV Encoding: Default (maps to ITU-R 601)
        Quantization      : Default (maps to Full Range)
        Flags             : 
Crop Capability Video Capture:
        Bounds      : Left 0, Top 0, Width 1920, Height 1080
        Default     : Left 0, Top 0, Width 1920, Height 1080
        Pixel Aspect: 1/1
Selection: crop_default, Left 0, Top 0, Width 1920, Height 1080, Flags: 
Selection: crop_bounds, Left 0, Top 0, Width 1920, Height 1080, Flags: 
Streaming Parameters Video Capture:
        Capabilities     : timeperframe
        Frames per second: 10.000 (10/1)
        Read buffers     : 0
                     brightness 0x00980900 (int)    : min=0 max=255 step=1 default=128 value=128
                       contrast 0x00980901 (int)    : min=0 max=255 step=1 default=128 value=128
                     saturation 0x00980902 (int)    : min=0 max=255 step=1 default=128 value=128
 white_balance_temperature_auto 0x0098090c (bool)   : default=1 value=1
                           gain 0x00980913 (int)    : min=0 max=255 step=1 default=0 value=105
           power_line_frequency 0x00980918 (menu)   : min=0 max=2 default=2 value=2
      white_balance_temperature 0x0098091a (int)    : min=2000 max=6500 step=1 default=4000 value=5838 flags=inactive
                      sharpness 0x0098091b (int)    : min=0 max=255 step=1 default=128 value=128
         backlight_compensation 0x0098091c (int)    : min=0 max=1 step=1 default=0 value=0
                  exposure_auto 0x009a0901 (menu)   : min=0 max=3 default=3 value=3
              exposure_absolute 0x009a0902 (int)    : min=3 max=2047 step=1 default=250 value=333 flags=inactive
         exposure_auto_priority 0x009a0903 (bool)   : default=0 value=1
                   pan_absolute 0x009a0908 (int)    : min=-36000 max=36000 step=3600 default=0 value=0
                  tilt_absolute 0x009a0909 (int)    : min=-36000 max=36000 step=3600 default=0 value=0
                 focus_absolute 0x009a090a (int)    : min=0 max=250 step=5 default=0 value=40 flags=inactive
                     focus_auto 0x009a090c (bool)   : default=1 value=1
                  zoom_absolute 0x009a090d (int)    : min=100 max=500 step=1 default=100 value=100

These are my list-exts output (I've shortened it for brevity):

pi@octopi4:/etc/init.d $ v4l2-ctl --list-formats-ext
ioctl: VIDIOC_ENUM_FMT
        Type: Video Capture

        [0]: 'YUYV' (YUYV 4:2: 2)
...
                Size: Discrete 1920x1080
                        Interval: Discrete 0.200s (5.000 fps)
                Size: Discrete 2304x1296
                        Interval: Discrete 0.500s (2.000 fps)
                Size: Discrete 2304x1536
                        Interval: Discrete 0.500s (2.000 fps)
        [1]: 'H264' (H.264, compressed)
...
                Size: Discrete 1920x1080
                        Interval: Discrete 0.033s (30.000 fps)
                        Interval: Discrete 0.042s (24.000 fps)
                        Interval: Discrete 0.050s (20.000 fps)
                        Interval: Discrete 0.067s (15.000 fps)
                        Interval: Discrete 0.100s (10.000 fps)
                        Interval: Discrete 0.133s (7.500 fps)
                        Interval: Discrete 0.200s (5.000 fps)
        [2]: 'MJPG' (Motion-JPEG, compressed)
...
                Size: Discrete 1920x1080
                        Interval: Discrete 0.033s (30.000 fps)
...
                        Interval: Discrete 0.200s (5.000 fps)

These are my /etc/init.d/webcam settings

#!/bin/bash

### BEGIN INIT INFO
# Provides:          webcam
# Required-Start:    $local_fs networking octoprint
# Required-Stop:
# Should-Start:
# Should-Stop:
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: webcam daemon for Octoprint
# Description:       Starts the webcam daemon with the user specified in
#                    /usr/local/bin/mjpg_streamer.
### END INIT INFO

MJPG_STREAMER_BIN="/usr/local/bin/mjpg_streamer"  # "$(dirname $0)/mjpg_streamer"
MJPG_STREAMER_WWW="/usr/local/share/mjpg-streamer/www"
MJPG_STREAMER_LOG_FILE="${0%.*}.log"  # "$(dirname $0)/mjpg-streamer.log"
RUNNING_CHECK_INTERVAL="2" # how often to check to make sure the server is running (in seconds)
HANGING_CHECK_INTERVAL="3" # how often to check to make sure the server is not hanging (in seconds)

VIDEO_DEV="/dev/video0"
FRAME_RATE="10"
QUALITY="80"
RESOLUTION="VGA"  # 160x120 176x144 320x240 352x288 424x240 432x240 640x360 640x480 800x448 800x600 960x544 1280x720 1920x1080 (QVGA, VGA, SVGA, WXGA)   #  lsusb -s 001:006 -v | egrep "Width|Height" # https://www.textfixer.com/tools/alphabetical-order.php  # v4l2-ctl --list-formats-ext  # Show Supported Video Formates
PORT="8080"
YUV="yes"

################INPUT_OPTIONS="-r ${RESOLUTION} -d ${VIDEO_DEV} -f ${FRAME_RATE} -q ${QUALITY} -pl 60hz"
INPUT_OPTIONS="-r ${RESOLUTION} -d ${VIDEO_DEV} -q ${QUALITY} -pl 60hz -f ${FRAME_RATE}"  # Limit Framerate with  "--every_frame ", ( mjpg_streamer --input "input_uvc.so --help" )


if [ "${YUV}" == "true" ]; then
	INPUT_OPTIONS+=" -y"
fi

OUTPUT_OPTIONS="-p ${PORT} -w ${MJPG_STREAMER_WWW}"

# ==========================================================

What's the error in your /var/log/webcamd.log when it doesn't work? I have the same camera and it works fine in MJPG mode. The only change I made was setting camera_usb_options="-r 1920x1080 -f 10" in /boot/octopi.txt to get the resolution I want.

Ok I'm not running the octopi image though, I build everything from scratch from the 'latest' buster version, using these steps: https://community.octoprint.org/t/setting-up-octoprint-on-a-raspberry-pi-running-raspbian/2337 because I still want to use the pi for something else.

I'll try to locate the logs, I can't seem to find the webcam daemon logs at the stated location.
This is the relevant line in my daemon: MJPG_STREAMER_LOG_FILE="${0%.*}.log" # "$(dirname $0)/mjpg-streamer.log". Tried locate mjpg-streamer.log turned up nothing too. Any other way I can get the error files?

Update: I did a sudo apt full upgrade while trying to upgrade the firmware to get uhubctl on another pi4 with the same image and it seems to be working there without the YUV flag. So I think it might be an issue with some of the earlier buster releases.