#mask pattern does not work in wall "filling"

Server Implementation

Paper

Server Version

1.20

Describe the bug

Using the pattern "#mask[=y>=-64&&y<=63][stone][grass_block]" in worlds.yml for wall filling does not work. But it does work with the command: /p set wall #mask[=y>=-64&&y<=63][stone][grass_block]

To Reproduce

1. Create any world.yml
2. Change worlds.yml to:

worlds:
  test:
    plot:
      height: 64
      size: 45
      filling: dirt
      floor: grass_block
      bedrock: true
      biome: minecraft:plains
      sign_material: SPRUCE_WALL_SIGN
      auto_merge: false
      create_signs: true
    wall:
      place_top_block: true
      block: stone_slab
      block_claimed: deepslate_brick_slab
      filling: '#mask[=y>=-64&&y<=63][stone][grass_block]'
      height: 64
    road:
      width: 9
      height: 64
      block: stone
      flags: {}
    home:
      nonmembers: side
      default: side
    schematic:
      specify_on_claim: false
      on_claim: false
      file: 'null'
      schematics: []
    chat:
      forced: false
      enabled: true
    economy:
      prices:
        merge: 100
        sell: 0
        claim: 100
      use: true
    world:
      max_gen_height: 319
      max_height: 320
      gamemode: survival
      min_gen_height: -64
      min_height: -63
      border: false
      border_size: 1
    event:
      spawn:
        egg: true
        breeding: false
        custom: true
    natural_mob_spawning: false
    mob_spawner_spawning: true
    flags: {}
    misc_spawn_unowned: false```

3. Startup error in console "Failed to parse pattern"

### Expected behaviour

The pattern should also work in the worlds.yml, not only with a command.
(It should fill everything up with stone, except for the block at height 64, which should be grass_block)

### Screenshots / Videos

_No response_

### Error log (if applicable)

[20:52:46 ERROR]: [PlotSquared/ClassicPlotWorld] Failed to parse pattern '#mask[=y>=-64&&y<=63][stone][grass_block]', check your worlds.yml
[20:52:46 ERROR]: [PlotSquared/ClassicPlotWorld] Falling back to minecraft:stone

### Plot Debugpaste

https://athion.net/ISPaster/paste/view/eac02ef7ea36477a95c8e0dc96a0dec7

### PlotSquared Version

7.3.2-Premium

### Checklist

- [X] I have included a Plot debugpaste.
- [X] I am using the newest build from https://www.spigotmc.org/resources/77506/ and the issue still persists.

### Anything else?

_No response_

Start with the worlds.yml wall.filling configuration and the pattern-parsing path that reports “Failed to parse pattern”; compare it with the /p set wall command path, where the same pattern works. Reproduce on PlotSquared 7.3.2-Premium using the supplied configuration. Done means startup accepts the pattern and wall filling uses stone except at height 64, which uses grass_block.