FortiGate cannot restore configuration file after private-data-encryption is re-enabled

In a new enhancement, enabling private-data-encryption will utilize a randomly generated private key. Therefore, FortiGate cannot restore the configuration file in the following sequence:

1. private-data-encryption enabled with random key, and configuration is backed up.

2. private-data-encryption disabled.

3. private-data-encryption enabled again, with new random key.

4. Restore configuration file in step 1.

When disabling private-data-encryption, a warning in the CLI will be displayed:

This operation will restore system default data encryption key!

Previous config files encrypted with the private key cannot be restored after this operation!

Do you want to continue? (y/n)y