It's possible that this studio became a part of Bazooka Studio in '95, based on a "Bazooka Studio 450" credit starting to appear at around the same time as our last Studio 450 entry.
last studio 450 credit we have is for a Jul 21, 1995 release
earliest Bazooka Studio 450 credit we have is for a Jul 26, 1995 release
edit:
Takashi Kitaguchi having engineering credits for both studios further supports this theory.