Dropped items in creative disappear

When in creative mode, trying to click and release an item out of your inventory with the mouse, as to
drop it on the ground or into a hopper, may disappear. The fix is to close and reopen the launcher. This
bug does not occur 100% of the time.

What I expected to happen was...:
Item falls to the ground and turns into an entity

What actually happened was...:
Item disappears

Steps to Reproduce:
1. Open a map in creative
2. Press E to enter the inventory