form表单验证失败，TypeError: child.onFieldChange is not a function

很简单的一个表单，验证一直报错：
TypeError: child.onFieldChange is not a function
at _callee$ (uni-forms.vue:330:1)

断点进去看了下发现这里进入了4次，有点不理解。

下面是代码：

<template>  
    <view class="forget-page">  
        <image class="logo" src="../../static/image/logo.png" mode="aspectFit"></image>  

        <uni-forms :modelValue="formData" ref="form">  
            <uni-forms-item label="旧密码" name="password" >  
                <uni-easyinput type="text" v-model="formData.password" placeholder="请输入旧密码" />  
            </uni-forms-item>  
            <uni-forms-item label="新密码" name="newPassword" >  
                <uni-easyinput type="text" v-model="formData.newPassword" placeholder="请输入新密码" />  
            </uni-forms-item>  
            <uni-forms-item label="确认密码" name="confirmPassword" >  
                <uni-easyinput type="text" v-model="formData.confirmPassword" placeholder="请再次输入新密码" />  
            </uni-forms-item>  

        </uni-forms>  
        <button class="login-btn" @click="restartPassword">重置密码</button>  

    </view>  
</template>  

<script>  
export default {  
    data() {  
        return {  
            formData: {  
                password: "",  
                newPassword: "",  
                confirmPassword: "",  
            },  
            rules: {  
                password: {  
                    rules: [{  
                        required: true,  
                        errorMessage: '请输入旧密码',  
                    }]  
                },  
                newPassword: {  
                    rules: [{  
                        required: true,  
                        errorMessage: '请输入新密码',  
                    }, {  
                        pattern: /^(?=.*[A-Z])(?=.*[0-9])(?=.*[a-z])(?=.*[!@#$%^&*?]).{8,16}$/,  
                        errorMessage: '密码由8位以上数字，大小写字母，特殊字符组成',  
                    }],  
                },  
                confirmPassword: {  
                    rules: [{  
                        required: true,  
                        errorMessage: '请再次输入新密码',  
                    }, {  
                        validateFunction: function (rule, value, data, callback) {  
                            // debugger  
                            if (value != data.newPassword) {  
                                callback('两次输入的密码不一致')  
                            }  
                            return true  
                        }  
                    }],  
                }  
            }  

        };  
    },  
    onReady() {  
        // 需要在onReady中设置规则  
        this.$refs.form.setRules(this.rules)  
    },  
    methods: {  
        restartPassword() {  
            this.$refs.form.validate().then(res => {  
                const param = {  
                    oldPassword: this.formData.password,  
                    newPassword: this.formData.newPassword,  
                }  
                this.$http.put('/updatePwd', param, true).then(res => {  
                    this.$tool.showSuccess('重置成功')  
                })  
            }).catch(err => {  
                console.log('表单错误信息：', err);  
                this.$tool.showToast(err)  
            })  

        }  
    }  
}