In inventory slots, If you have Minecart with Chest, it doesn't display christmas textured chest.
How to reproduce:
1 Give yourself a Minecart with Chest
2 Look closely to it's texture
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Does it as an entity?
Also, yes, it does matter

That would need to be decided by Mojang. However these textures only last 3 days (Dec 24-26) and the 2d item texture for the minecart with a chest has been like that before I think. If resolved as a WAI might just move the problem to the feedback site.

It also doesn't show in the statistic menu

The xmas chests textures are now disabled, as it is no longer Dec 26.

I posted this issue in Dec 24th
Oh come on does it matter ?