The deeper you go into the Sailor Moon S tech, you’ll discover a crazy system with a lot of fine intricacies to be aware of, including a potential reason for what could have been deemed dropped inputs.
In Sailor Moon S, forward and crouching inputs take precedence over attack inputs, meaning that a forward, back, or crouching input that is not held down while hitting a button input can actually eat your attack inputs. But if you look further, we see some interesting options selects, as throws take precedence over specials. You can thus use specials as a buffer for throws, and if you are in range, you will get the throw as opposed to the special.
In these videos compiled by Sailor Moon S player Koushun, you can see how this input priority system comes together. As well as the aforementioned quirks, Koushun also goes over ways to work around the lack of an input buffer at the start of rounds.
Source: koushun1022