How to force Auxiliary Kext collection to be rebuilt on BigSur

We have kernel extension - which works fine after setting the security level to allow 3rd party Kexts.

However, we are unable to uninstall the Kext.

Tried calling kumtil unload + removing the Kext from /Library/Extensions + reboot.

Also tried clear-staging.

But the only way to remove the kext from the aux. collection is to use the trigger-panic-medic from Recovery mode.

Thanks.
Devendra.

ps: Note that if we install a newer version - the aux. kext collection gets rebuilt correctly.