Forge be broke we need a Blacksmith

I again have been forging a map for +4 hours when I’m starting to care about what ive made and then I weld a large amount of blocks to make a lift to script. However, after saving the map and going of it for a few minutes I load the map back up and the welded objects have now become permanent that is not recognised in forge so I can’t delete it or move it or do anything. The map is ruined, please tell e there is a way to fix this, or am I screwed? If so, fix it 343!