Trapdoors react to redstone components from 2 blocks away in some cases

[theothertored]

Describe the bug In some cases, trapdoors react to redstone components from 2 blocks away:

Video demonstration

To Reproduce Build this setup (the background blocks are only there to make it easy to count blocks, they don't change the behaviour):

After pressing the button:

After opening all trapdoors and removing the dust:

After opening all trapdoors and readding the dust but not activating the button:

Expected behavior

• I don't expect adding unpowered redstone components to affect trapdoors at all
• I expect trapdoors to be powerable either directly or by powering a block adjacent to them, not from 2 blocks away and not by dust that isn't directed into them

Version info:

• Version 7.2_01