Prospective investors won't know that the reason the 3m 6m and 1yr options don't work for some funds is because the funds weren't out yet, not that website has a bug.

Maybe do a tooltip or info popup about that if they click on 3m, 6m or 1yr and the data doesn't exist.

Or, even better, if you put fund start date somewhere on the graph then they can figure it out.

I know the date is also further up page but I doubt prospective investors will remember that when looking at graph.