[lch]

To expand on what vfb already said, for games the mods that were activated when it was created are being saved into the game files and required to be present for auto-loading when opening the game files. For pretenders, this is not the case, you could have used a pretender that was designed with CBM on, and try to use it in a game without CBM.

Try to redo the game creation. If the pretenders still fail the check, you might want to make them available for inspection.