IIRC, POA was edited by ADM that way on purpose.
I agree with his decision to not add a scene with incomplete vfx.

As far as the tower scene, I think you're talking about when Harry is supposed to wake from a dream and think Sirius was in the tower.

Again, the problem is the scene doesn't work without the completed fx, so ADM made the most of what was there. (He briefly flirted with actually creating a dream sequence to add in.)

Can anyone corroborate what my crusty brain is telling me?