problems with function "rcosdesign"

hello, I was doing the pulse shaping with function "rcosdesign", but when I plotted the signal, the code is below:

rolloff = 0.35; % Rolloff factor

span = 6; % Filter span in symbols

sps = 100; % Samples per symbol

b = rcosdesign(rolloff, span, sps);

b2 = rcosfir(rolloff,span,sps,1);

d = 2*randi([0 1], 1000, 1) - 1;

x = upfirdn(d, b, sps);

x2 = upfirdn(d, b2, sps);

ax(1) = subplot(2,1,1);

plot(x); % signal with "rcosdesign" pulse shaping

ax(2) = subplot(2,1,2);

plot(x2); % signal with "rcosfir" pulse shaping

and it looked like this(figure above):

there were a lot of discontinuous points compared with singal filtered by old version function "rcosfir"(figure below). I was wondering if there is any bugs with the function "rcosdesign"?