select如何在关联选择模式下新增选项

实现场景：

select在关联选择模式下新增选项

存在的问题：

select在关联选择模式下配置creatable: true，没有新增选项一栏

当前方案：

官方例子加了creatable
{
"type": "page",
"body": {
"type": "form",
"api": "/amis/api/mock2/form/saveForm",
"body": [
{
"label": "关联选择模式",
"type": "select",
"name": "b",
"creatable": true,
"multiple": true,
"sortable": true,
"searchable": true,
"deferApi": "/amis/api/mock2/form/deferOptions?label=${label}",
"selectMode": "associated",
"leftMode": "tree",
"leftOptions": [
{
"label": "法师",
"children": [
{
"label": "诸葛亮",
"value": "zhugeliang"
}
]
},
{
"label": "战士",
"children": [
{
"label": "曹操",
"value": "caocao"
},
{
"label": "钟无艳",
"value": "zhongwuyan"
}
]
},
{
"label": "打野",
"children": [
{
"label": "李白",
"value": "libai"
},
{
"label": "韩信",
"value": "hanxin"
},
{
"label": "云中君",
"value": "yunzhongjun"
}
]
}
],
"options": [
{
"ref": "zhugeliang",
"children": [
{
"label": "A",
"value": "a"
}
]
},
{
"ref": "caocao",
"children": [
{
"label": "B",
"value": "b"
},
{
"label": "C",
"value": "c"
}
]
},
{
"ref": "zhongwuyan",
"children": [
{
"label": "D",
"value": "d"
},
{
"label": "E",
"value": "e"
}
]
},
{
"ref": "libai",
"defer": true
},
{
"ref": "hanxin",
"defer": true
},
{
"ref": "yunzhongjun",
"defer": true
}
]
}
]
}
}

Reproduce the problem with the supplied associated-mode select configuration, especially creatable: true together with deferApi and multiple selection. Inspect the associated select entry point and existing creatable behavior, then verify that the add-option control appears and works in this mode without breaking option loading.