Let’s assume one has created an encrypted partition, e. g. with the LUKS standard. Then one creates a (virtual) disk image, e. g. for use by a virtual machine, containing an encrypted partition created by the same method and using the same encryption password. The disk image is stored inside the outer encrypted partition. I assume that a symmetric encryption is used.
Is it possible that the parts of the real disk which are occupied by the encrypted partion of the inside disk image are visible in plain text (or something close to that) as if no encryption was used (due to applying the same symmetric encryption method twice)?
If yes, in which particular configuration?