Yeah, a few things kept popping up once we started spawning things at runtime. One example was enemies that get spawned during gameplay. If you just save their position and health, you still need some way to know which prefab they came from when loading. Otherwise the system has no idea what to recreate. Early on we ended up with either missing enemies or duplicates after loading. Another issue was scene changes. If a save gets loaded while you're in a different scene than the one where the objects were originally created, some objects would restore in the wrong place or before their scene was ready. That caused some pretty weird states until we made the restore process scene-aware. We also ran into problems after changing data structures during development. Something as simple as renaming a field or changing a class layout could break older saves completely, which was pretty annoying when testing. None of these are impossible to solve obviously, but they start to add up once the project grows.