Why is the tree on Stage 3 not lit up in the Steam version?

[竜一ゼキラ (Zekira G. Drake]

I got myself the dlsite version because I wanted to read the dialogue in Japanese.

I eventually noticed that after I beat Nico, the background clearly has the tree lit up and it's not just a black void like the final background of the Steam version.

I checked both again just to be sure, and noticed that in the Steam version, there's a black void space where the tree is supposed to be, in the outline of the tree itself.

It's nothing really major, but it does give the feel of beating Nico a much more different feel. The ending background being the lit-up tree really gives the ending feeling of "Christmas is saved!" rather than the black void which feels like just a generic "We've defeated the enemy!" kind of thing.

Screenshots:

Steam version https://i.imgur.com/eJxlbmc.jpg
Dlsite version https://i.imgur.com/TUpevz7.jpg

EDIT: Both shots are from Miracle difficulty though I don't think difficulty has anything to do with it