Spawners, when having blocks placed next to them, will have the opposite internal face culled. This appears to only affect the north and south faces, despite all faces of the model having similar cullface values.
How to reproduce
Place down a Spawner
Place a solid block either to the north or south of the Spawner
Observe as the opposite, inside face of the Spawner is culled
Linked issues
duplicates
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Comments


Woops, was unable to find the bug in the bug tracker prior to submitting the report
This duplicates MC-266463 🙂