### Godot version

v4.2.rc2.official [1ba920fad]

### System information

Godot v4.2.rc2 - macOS 14.1.1 - Vulkan (Forward+) - integrated Apple M1 - Apple M1 (8 Threads)

### Issue description

Crash when trying to use "cell_quadrant_size".

The same project works without problems in 4.1.3

### Steps to reproduce

Open the attached project and run it, it'll crash. "Invalid get index"
![スクリーンショット 2023-11-27 16 35 07](https://github.com/godotengine/godot/assets/106015575/50d38ceb-0e6e-49bc-96dc-60abd1d2b6c0)

Here is what the same project looks like when launched from 4.1.3:
![image](https://github.com/godotengine/godot/assets/106015575/4e7e1f1a-ad5b-40ab-90ae-35130c803f09)

### Minimal reproduction project

[engage bug 03.zip](https://github.com/godotengine/godot/files/13471828/engage.bug.03.zip)

TerrainConstraint terrain_bit_constraint = TerrainConstraint(tile_map_node, p_position, bit, terrain_pattern.get_terrain_peering_bit(bit));
				in_set_constraint_element = p_constraints.find(terrain_bit_constraint);
				if (in_set_constraint_element) {
					if (in_set_constraint_element->get().get_terrain() != terrain_bit_constraint.get_terrain()) {
						score += in_set_constraint_element->get().get_priority();
					}
				} else if (p_current_pattern.get_terrain_peering_bit(bit) != terrain_pattern.get_terrain_peering_bit(bit)) {
					invalid_pattern = true; 
					break;
				}
			}
		}
		if (invalid_pattern) {
			continue;
		}
		terrain_pattern_score[terrain_pattern] = score;
	}
	
	TileSet::TerrainsPattern min_score_pattern = p_current_pattern;
	int min_score = INT32_MAX;
	for (KeyValue<TileSet::TerrainsPattern, int> E : terrain_pattern_score) {
		if (E.value < min_score) {
			min_score_pattern = E.key;
			min_score = E.value;
		}
	}
	return min_score_pattern;
}
RBSet<TerrainConstraint> TileMapLayer::_get_terrain_constraints_from_added_pattern(const Vector2i &p_position, int p_terrain_set, TileSet::TerrainsPattern p_terrains_pattern) const {