Can't get shaped recipes to work

[tranquil nest]

I have no clue what I'm doing wrong, I've tried copy-pastes from both the wiki and TerraFirmaGreg, it just won't work, sometimes it doesn't claim there's any error.

  `event.shaped('exposure:camera', 
    [ 
      ' BB',
      'LLH',
      ' MM'
    ],
    {
      B: '#minecraft:wooden_buttons',
      L: 'tfc:lens',
      H: 'kubejs:camera_hull',
      M: 'tfc:brass_mechanisms'
    }
  )`

[minor sentinel]

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[muted obsidian]

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[tranquil nest]

the "failing point" seems to be specifically the part where the recipe has to craft the camera for some reason (switching around everything seems to solve it, the recipe just can't craft the camera