Extended block updates do not propagate outwards

The bug

Redstone components can be powered from a redstone wire that is no longer powered.

To reproduce

1. Place a block of TNT on the ground
2. Place redstone dust on the ground directly in front of the TNT block
3. Place a redstone torch next to the redstone dust, in such a way that it is diagonal to the TNT block
4. Break the torch
   → The TNT ignites for some reason

Video

Minecraft 1.15 Pre-Release 2 2019-11-27 16-26-00.mp4