Primed TNT cannot travel through nether portals

The Bug:

Primed TNT cannot travel through nether portals.

Steps to Reproduce:

1. Build the setup shown in the attachment below. setup.png
2. Enter the nether portal to ensure that the chunks in the nether are loaded.
3. Return to the overworld and ignite the TNT.
4. Take note as to whether or not primed TNT can travel through nether portals.

Observed Behavior:

Primed TNT cannot travel through nether portals.

Expected Behavior:

Primed TNT would be able to travel through nether portals.

Code Analysis:

Code analysis by Kyle Weber can be found in this comment.