[BUG] get uft code in callbackAfterDisMissGroupCommand

[HuXinjing]

OpenIM Server Version

3.8.3-patch.3

Operating System and CPU Architecture

Windows (AMD)

Deployment Method

Docker Deployment

Bug Description and Steps to Reproduce

HTTP POST
/callbackExample/callbackAfterDisMissGroupComi
)":"5141389096","groupType":"\u0002",
"membersID :
and ,"groupID":"3240241223"
.owner
解析JsON失败: json: cannot unmarshal string into Go struct field AfterDismissGroupReg

Screenshots Link

No response