Spawners' inner faces have inverted cullfaces

The monster spawner block was updated to render its inner faces, more closely resembling a cage. The newly introduced trial spawners also behave the same. However, when a solid block is placed beside it, the opposite face may be culled.

Steps to Reproduce:

1. Place a monster spawner/trial spawner;

2. Place any solid block right beside its northern or southern;

3. Look inside the block through the transparent gaps.

Observed Results:
The north and south cullfaces are reversed. East, west, up and down behave normally.

Expected Results:
The cullfaces match the direction.

Screenshots/Videos attached: Yes

Notes: