bugs: 类型为【附件】的字段，被退回到编辑状态重新上传新文件后，field_value出错

[AndrewChung-GitHub]

使用的版本: r2.0.17

• 被退回到编辑状态重新上传新文件

boolean_field_display: {}
default_value: ""
description: ""
field_attribute: 1
field_choice: {}
field_key: "attachment"
field_name: "工时Excel"
field_template: ""
field_type_id: 80
field_value: "[{\"file_name\":\"Timecard.xlsx\"}]"
label: {}
order_id: 3
placeholder: ""

• 正常flow下

boolean_field_display: {}
default_value: ""
description: ""
field_attribute: 1
field_choice: {}
field_key: "attachment"
field_name: "工时Excel"
field_template: ""
field_type_id: 80
field_value: "[{\"url\": \"/media/ticket_file/1e32b203-f909-11ed-b959-150016418e8f.csv\", \"file_name\": \"TimeCard.csv\"}]"
label: {}
order_id: 3
placeholder: 
""

[blackholll]

r2.0.18将修复

[blackholll]

没有复现该问题，请提供下详细复现过程