Sword and Bow disappearing in minecraft snapshot 19w19a

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
Use my sword
What actually happened was...:
Describe what happened here
My sword disappeared when I attacked a mob.
Steps to Reproduce:
1. Hit a mob with a sword.
2. Sometimes disappears and sometimes it does not
3. Finally your sword might disappear.