Chicken standing on a daylight sensor and killed by lava dispensed at their heads didn't generate any loot as intended, but reloading the chunk would cause these items to re-appear.

Specifically, this happens only if the lava existed for exactly 2 ticks and the chicken stands on a daylight sensor:

• If the lava existed longer than 2 ticks, no loot would be found even if the chunk was reloaded
• If the lava existed for less than 2 ticks, the loot will drop immediately.
• If the chicken is standing on a lower half slab and the lava existed less than 2 ticks, the loot drops normally
• If the chicken is standing on a lower half slab and the lava existed 2 ticks or longer, the loot will not drop even if the chunk is reloaded

More observations:

• A hopper placed under the daylight sensor(emitting no redstone signal) can collect the loot if the lava existed less than 2 ticks

Expected behavior:

The loot should either be destroyed permanently, or be generated at the feet of the chicken with lava appearing for less than 5 ticks, as in version 1.13.2 and before.

Steps to reproduce: 

1. Build a W3*H2*D3 glass cube. Break the two blocks at the center(top-down view) of the cube, and place a daylight sensor at the bottom.

2. Spawn some chicken on the daylight sensor

3. Place a dispenser that will dispense lava onto the top block at the center. Connect the dispenser to a pulse circuit that will send the dispenser a one-tick pulse followed by another one-tick pulse 2 ticks later

4. Observe that the chicken are killed and no loot are produced

5. Teleport away and back, or restart the game to reload the chunk. Observe that feather and cooked chicken can now be found on the daylight sensor.

Attached are images that show the chamber described above.