The map becomes dark regardless of lighting when crouched in a 1x1 space

The bug

When using a trapdoor to crouch in a 1x1 space, the map becomes dark in the hand regardless of depth or available light. It happens with both the normal map and the locator.

How to reproduce:

1. Create a map;
2. Use a trapdoor to crouch and enter a 1x1 block space;
3. Place a light source nearby;
4. Observe the brightness of the map;

Observed results:{}

Map is dark regardless of brightness

Expected behavior:

Map brightness should be in accordance with surrounding brightness