Not sure if vadis got around to checking this out yet, thought I'd make a report just in case.

EDIT:

It appears they can hit you through blocks as well. I was in a solid corner inside a hollow 5x5 box and they were able to hit me. (they're solid white due to Fast Render being on in Optifine)

Versions

Betweenlands version:

3.3.0 dev-659

Forge version:

Forge 1.12.2-14.23.1.2606

Singleplayer or Multiplayer:

Singleplayer.

Installed mods:

Appleskin 1.12.21.0.9
B.A.S.E 1.12.2-3.5.1
Better Fps 1.4.8
Better Placement 1.0.0-1
Client Tweaks 3.1.2
Clumps 3.0.0
FoamFix 1.12.2-0.9.0-Anarchy
Friendly Fire 1.5.8
Waila/Hwyla 1.8.23
InventoryTweaks-1.64-dev
Keyboard Wizard 1.12.2-1.5.3-b1
Macro Key 1.1.6.3
Mouse Tweaks 2.8
Nature's Compass 1.5.1
Ninja's Mods 1.12
Optifine 1.12.2 C8
StepUp 4.0-mc1.12
SwingThroughGrass 1.12.2-1.2.3
TapeMouse 1.1.3.17
Texture Fix 4.0
The Betweenlands 3.3.0 dev-659
XYZing 1.0

Description of the problem

How to reproduce:

1. Spawn a Chiromaw outside a box or something.
2. Give it the vanilla "glowing" effect.
3. Go into survival and watch it track you through the wall.

Expected result:

For the Chiromaw to act like normal mobs, and not see me through the wall.

Actual result:

They can see you through walls.