Actually, there is a recent amendment in this. I am not sure whether it is an amendment in the Act or just an amendment in the rules, but it is surely there.
As you know, your PF shares go into two accounts, EPF A/c (Employees' Provident Fund) and FPF A/c (Family Pension Fund). If you leave your job within 6 months, you will only get the amount in your EPF account, but NOT the amount in the FPF account; i.e., you can fill out only Form No. 19.
Whereas, if you leave your job after 6 months, you will get both the shares of your PF account, i.e., you can fill out Form 19 as well as Form 10C, or 10D, whichever is applicable.
I don't know why this weird order has been passed, but it is definitely there, and it is a recent amendment.
Cheers,
Kapil