Enabled FileVault with disabled SSV possible with Big Sur?

My Hardware is a 2019 MacBook Pro 15" has the T2 chip and runs macOS 11.0.1.

After disabling SSV via csrutil authenticated-root disable and rebooting I can not enable FileVault. Unfortunately the error is very generic: "FileVault Failed An internal error has occurred."

Is it possible to have signed system volume (SSV) disabled but FileVault enabled?

Solution 1:

According to user experiences - this is not possible. Disabling SSV will leave the system stripped out of both SIP and File Vault.

https://eclecticlight.co/2020/06/25/big-surs-signed-system-volume-added-security-protection/#comments