The old four speeds had at least one neutral for every gear and it was easy to miss a shift through no fault of your own.
Oh - and welcome to the forum
I moved my shifter up one notch, made a huge difference in positive shifting.
Ya, as others have mentioned this is normal.. You have to make positive shifts, and eventually you will not notice it and only hit a false neutral once in a while. It did seem to smooth out for me around 1000 miles.
It does get better with break in, it's always better if you pay more attention
The next time you get a shift where you end up with a neutral, rather than shifting back down to a lower gear, pull in the clutch lever and try shifting it into the missed gear again. This time be sure to fully raise the shift lever with your foot.I've tried this several times and I've always ended up in the gear that I had wanted.
-Second the notion of having a good boot, with a firm toe to help you get that gear up.