### 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)

TileData *tile_data = atlas_source->get_tile_data(cell.get_atlas_coords(), cell.alternative_tile);
				if (tile_data && tile_data->get_terrain_set() == p_terrain_set) {
					current_pattern = tile_data->get_terrains_pattern();
				}
			}
		}
		TileSet::TerrainsPattern pattern = _get_best_terrain_pattern_for_constraints(p_terrain_set, coords, constraints, current_pattern);
		
		RBSet<TerrainConstraint> new_constraints = _get_terrain_constraints_from_added_pattern(coords, p_terrain_set, pattern);
		for (const TerrainConstraint &E_constraint : new_constraints) {
			if (constraints.has(E_constraint)) {
				constraints.erase(E_constraint);
			}
			TerrainConstraint c = E_constraint;
			c.set_priority(5);
			constraints.insert(c);
		}
		output[coords] = pattern;
	}
	return output;
}
HashMap<Vector2i, TileSet::TerrainsPattern> TileMapLayer::terrain_fill_connect(const Vector<Vector2i> &p_coords_array, int p_terrain_set, int p_terrain, bool p_ignore_empty_terrains) {
	HashMap<Vector2i, TileSet::TerrainsPattern> output;
	const Ref<TileSet> &tile_set = tile_map_node->get_tileset();
	ERR_FAIL_COND_V(!tile_set.is_valid(), output);
	ERR_FAIL_INDEX_V(p_terrain_set, tile_set->get_terrain_sets_count(), output);
	
	Vector<Vector2i> can_modify_list;
	RBSet<Vector2i> can_modify_set;