This report is long over due, this started happening about a few months ago and I had originally thought it was reported.
The player crafting animation is missing some of the black lines in the top left corner when crafting without holding an item.
Something else to note is that the arms go behind the character when crafting with holding something. Otherwise the arms appear in front of them.
Craft something! Notice the black scribble effect is missing unless you have a hand slot item held.