[MC-107967] Falling Sand glitching out

When placing sand/gravel/anvil/dragon egg that it would fall down the summoned fallingsand entity glitches out:

For a more detailed look, watch: https://youtu.be/GWCV5T6ejs0

Testing was done in a DEFAULT world generated with the 16w39c snapshot

The (primed)tnt entity on the other hand behaves completely normal (as it is a completely different entity after all.)

Environment

Windows 10 Anniversary Update
Java 1.8.0_101
PC: - i7 5820k @ 4Ghz - GTX980 (driver: 372.90) - 16GB RAM

Cannot reproduce. Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (minecraft/crash-reports/crash-<DATE>-client.txt) here.

I tested that effect again and it happened again, just like in the video I posted

Fixed in 16w40a

Still an issue in 1.12. Unless I'm mistaken somehow. https://youtu.be/WwGrkm6u7mM (video proof)