The restriction is intended to reward people that play through the game to access the CGs. In the past, we had people that would just rip through all the art assets and then ask when the next build was. So to prevent that and make it feel earned, we restrict how the CGs are unlocked by requiring them to have accessed the scenes.
Unfortunately in this case, you have already unlocked them by playing previously, but we don't have a work around, unless you go through the debug menu to access those specific scenes and play through them to unlock their CGs.