Pass-through logic has been added

Its a good question, and you're right to correct alteraaditya. It can come down to how the inference works. because you've asked for a true dual port ram (because you have 2x read port) it may be doing something in a specific way, or it could be the chip you're using.

It is probably worth first reading the HDL coding style guidlines in the altera handbook, followed by raising a mysupport case with altera, as they can be good at pinning down why things happen the way they do.