How about the following?
tail = [1 2 2 4 5 3];
head = [2 4 5 3 3 6];
% Create graph object
G = graph(head,tail);
% Find a shortest path between 2 and 3
path = shortestpath(G,2,3); % <- this returns your expected output : [2 4 3]
% Visualize the result
figure
h = plot(G);
highlight(h,path,'EdgeColor','r','LineWidth',2)
