Player attributes from items disappear when switching from offhand to main hand

Player attributes from items disappear when switching from offhand to main hand

 

 ** I tested the new custom crafting recipe from the new snapshot and gave myself a modified iron pick that gives more block reach and armor. I then noticed when I was spam-clicking item swap, the armor points weren't appearing when I switched the item back to my main hand.

However, it appeared again when I took it off my main hand and back again.