While debugging KGlobalAnimParser.ParseAnimData for a mod, I realised the data for painting_wide_kanim seems a little odd.
The KAnim.Anim.Frame says it has 5 elements (other paintings only got 4). Looking into the frame elements it seems there is a duplicate element. The 3rd and 4th frame element both has the same symbol (e.g. "art_3x2_a"), transform, etc. (the others are frame, stretch marks and backing).
I guess that was an error in data export? It doesn't really lead to any problems ingame as it's just the same sprite being used twice on top of each other.