Relates to MC-189617, MC-181095 and MC-216454
The bug
The third person camera treats minecraft:spawner blocks as fully solid opaque cubes and cannot pass through them.
I consider this to be a bug due to the fact that copper grates, which, like spawners, are a visually transparent lattice of metal, do in fact allow for the third person camera to pass through, making this an inconsistency in behaviour.
There are multiple bugs of this kind. We are taking them on case by case basis. Please do not ask for a review, we will take this work on a different track instead of handling them as bugs.