it explicitly contains instructions to set the origin to (0, 0) and the size to (1024, 768).
Sorry, I should have mentioned that explicitly. I had not noticed those window-positioning instructions when I first reported the bug (so I included the window position in my list of bugs), but I noticed it later, which is why I tried setting those variables in Config.prc to imitate those instructions.
I agree that the window position is not a bug, only the obscured title bar. (And since the next user-initiated resize corrects it, it’s pretty minor.)
(BTW this is not in Yosemite but in the prior Mac OS X, Mavericks.)