Following today's update, a few items in my inventory grid are invisible. Not sure if it's the item itself, or the model being used, but it's affecting my quarterstaff, armor, weapons, hood, herbalist's mortar and pestle, and a few others that I haven't managed to find yet. Weapons and armor appear as usual on the character model. I haven't made any changes on my end.
EDIT: It seems like it may be certain parts are missing their inventory icon. One of my bows has the 'handle' (bottom) visible still, and my armor has everything but the torso visible. Some spell icons are gone, too. Anything non-vanilla.
Double Edit: It's only on the one character. The same items and spell icons are visible on an alt.
That seems to have resolved itself for no apparent reason, even after multiple game restarts.