'''Ok Guys So Here’s the FIX with BIG SUR'''
I did few modifications with whatever was available on internet to solve this problem
Step 6 & 7 are few modifications which I did.
Here it goes
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Reboot in recovery mode (CMD+R)
# Utilities -> Terminal
# csrutil disable
# csrutil authenticated-root disable
# mount - uw /Volumes/Macos (Enter WHATEVER YOUR MACOS DRIVE NAME IS, my macOS drive name is Macos)
# cd /Volumes/Macos (Enter WHATEVER YOUR MACOS DRIVE NAME IS, my macOS drive name is Macos)/System/Library/Extensions
# rm -rf AppleThunderboltNHI.kext
# rm -rf /System/Library/Caches/*
# Kmutil install -u --force --volume-root /Volumes/Macos (Enter WHATEVER YOUR MACOS DRIVE NAME IS, my macOS drive name is Macos)/System/Library/Extensions
# bless -folder /Volumes/Macos(Enter WHATEVER YOUR MACOS DRIVE NAME IS, my macOS drive name is Macos)/System/Library/CoreServices —bootefi --create-snapshot
FORGET THE PROBLEM :-D
You’ll need to perform these steps every time you update Big sur with their security updates n all.
No need to enable SIP
Have a good life :-)