Unfortunately I don't have a good way to look inside a savegame like it was possible for Morrowind using the Enchanted Editor. I can only say that the save is corrupted (as in: Nehrim crashes when I want to load it) but Wrye Bash doesn't report anything strange. If you want to contribute something to fixing the Nehrim bugs, you could try searching for your LAST non-corrupted save (the last one that can still be loaded in Morrowind) and tell us what you did afterwards, so we get an idea where the bug lies. But I fear the bug comes from the Oblivion engine...