There's an image of Umiko sitting on the side of the pool and the reflection in the pool seems all wrong. You shouldn't be able to see her hands there.
I've looked through the images in the base release and am having trouble finding the image you're referring to.
There's a rare one you can get with the laptop, I'll post it below.
Is this the one you're referring to?
I photo edit everything, but that one escapes my memory. I think I removed like 70% of the Koi fish in the shot... maybe the hand thing got caught up in my editing?
Interesting. I can't remember it well enough to debate it, but I'll take your word for it.
This makes you the first person who's pointed a visual issue like this out.
Since you are, here's a look at the most edited image in the base release.
The finished version:
The unedited, messed up version:
Notice the main character's right leg is completely missing, among other things.
When you render 2k images, it's tough to make everything go perfectly, but I'm not complaining. It honestly makes me laugh when I see the image.