Yes, it was an error from the developers, they already fixed it, if you go to the page where you bought patch 1 it should appear that they updated it.I just copied all patch files except data onto the original and the patch from muninkai and worked just fine. i think the new ending not being in the gallery is a creator problem not the english patch.
In my case the updated version of patch 1 gave me an error when I opened the game, I had to update the base game as well to make it work.
The screenshot is from dlsite.