Yeah. Short version is they ran out of space on the cartridge, and didn't want to pay more for a larger size. They had to abruptly cut the final level, amongst other things. Factor 5 says they're sitting on the full rom, even offered Nintendo to release that one on the VC instead of the original retail version, but Nintendo's VC policy was against things like that at the time.
You can read more about it here:
http://www.nintendolife.com/news/201...e_back_in_2008

