[MC-215470] Faulty Spider spawn on Mineshafts

The spawner and webs spawned on open air. I presume the intentional behaviour is always to spawn inside a room.

Seed:
-7683799699323588480

at 826, -11, -742

Linked issues

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We're tracking this issue in MC-215398, so this ticket is being resolved and linked as a duplicate.

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