As said, the manor levels in Legend and Anniversary are very short, and best just to play it in the one sitting. The games are then saved to the next level once you move on, into them.
I did not know there was bug issues in the manor levels, but I always played them right through in the one go, so would not have spotted them.
Once you have finished the games normally, if you have the PC version, its is worth playing the manor levels with TRL fly and TRA fly, just to find all the interesting places outwith the normal play routes.
PS...Also use fly cheats for all the other levels, as there is a lot of hidden stuff worth exploring in these games