Step to reproduce
1. /give @p levitation 100 254.
2. Throwing item.
3. You can't collect an item.
Environment
OS : Windows 7 Ultimate (x86) 6.1 Service Pack 1
CPU : Pentium(R) Dual-Core CPU E5400 @ 2.70GHz
RAM : 2 GB DDR-2 RAM
Java : Java Development Kit 1.7.0 Update 75 (Used for modder development)
Graphic Card : NVIDIA GeForce 9500 GT
OpenGL Version : 3.3
Effect amplitudes outside the intended range may have odd results.