Resolution: Works As Intended
Spawner blocks do not cull the faces of other spawner blocks directly adjacent to them.
Such culling is generally characteristic of other transparent blocks, such as glass and slime blocks (
MC-119856). (Leaves not doing this is very likely a stylistic decision to make trees appear more realistic.)
- Place a spawner
- Place another spawner directly next to it
The face between the spawner block would not be rendered; this is the behaviour seen for glass.