Help Needed Magisk fails to install on latest MK100.0-dragon Nightly

Help Needed Magisk fails to install on latest MK100.0-dragon Nightly
1.0 1

Did a clean install latest 12/19/09 MK100.0-dragon-NIGHTLY on my Pixel C Tablet in Twrp 3.3.1-0
Formatted flashed rom first then flashed Open GApps then Magisk - v20.1 all went well no errors reboot to system installed Magisk Manager - v7.4.0 and Magisk Manager tells me Magisk not installed. Tried to install Magisk from with in Magisk Manager fails below image.
Ran Magisk-uninstaller-20191102 in Twrp reflashed Magisk in Trwp same issue again.

This below image is the error I get when I try and flash or re-flash from within Magisk Manager and a copy of Magisk Manager failed install bug report log

Any suggestions ?

  • Device platform: arm64-v8a
  • Copying image to cache
    1566+0 records in
    1566+0 records out
    1603584 bytes (1.5 M) copied, 0.015759 s, 97 M/s
    1045+1 records in
    1045+1 records out
    1070668 bytes (1.0 M) copied, 0.010863 s, 94 M/s
  • Unpacking boot image
    Parsing boot image: [/data/user_de/0/com.topjohnwu.magisk/install/boot.img]
    ! Unsupported/Unknown image format
    ! Installation failed

I met the same problem

Did you find a solution ?

no, i flash remix

Do you have a link to Remix for Pixel C ?
I want to try it
I went with PixelExperience below link

Bro rename the file to .img which you are installing to magisk and switch off the device
Then boot to twrp recovery and install that file again
Changing type install zip to install image
Then all done
Enjoy magisk installed

Bro rename the file to .img which you are installing to magisk and switch off the device
Then boot to twrp recovery and install that file again
Changing type install zip to install image
Then all done
Enjoy magisk installed

No need seems magisk issue is fixed normal flash worked