webhook 配置message.dropped后开启插件报错 web.hook.rule.message.dropped.1 = {"action": "on_message_dropped"}

File: [/zh_CN/advanced/webhook.md](https://docs.emqx.cn/broker/v4.2/advanced/webhook.html)

Start with the linked file, /zh_CN/advanced/webhook.md, and inspect the webhook configuration for the message.dropped event and the on_message_dropped action. Reproduce the reported error when enabling the plugin, then update the documentation only after confirming the correct configuration and verifying that the documented setup no longer causes the error.

Written by the indexing model from the issue text.