payload: {"action":"created","issue":{"url":"https://api.github.com/repos/facebook/react/issues/12124","repository_url":"https://api.github.com/repos/facebook/react","labels_url":"https://api.github.com/repos/facebook/react/issues/12124/labels{/name}","comments_url":"https://api.github.com/repos/facebook/react/issues/12124/comments","events_url":"https://api.github.com/repos/facebook/react/issues/12124/events","html_url":"https://github.com/facebook/react/issues/12124","id":293010754,"node_id":"MDU6SXNzdWUyOTMwMTA3NTQ=","number":12124,"title":"Unexpected DOM elements in list rendering with duplicate keys","user":{"login":"intellild","id":8379858,"node_id":"MDQ6VXNlcjgzNzk4NTg=","avatar_url":"https://avatars2.githubusercontent.com/u/8379858?v=4","gravatar_id":"","url":"https://api.github.com/users/intellild","html_url":"https://github.com/intellild","followers_url":"https://api.github.com/users/intellild/followers","following_url":"https://api.github.com/users/intellild/following{/other_user}","gists_url":"https://api.github.com/users/intellild/gists{/gist_id}","starred_url":"https://api.github.com/users/intellild/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/intellild/subscriptions","organizations_url":"https://api.github.com/users/intellild/orgs","repos_url":"https://api.github.com/users/intellild/repos","events_url":"https://api.github.com/users/intellild/events{/privacy}","received_events_url":"https://api.github.com/users/intellild/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":3,"created_at":"2018-01-31T02:33:40Z","updated_at":"2019-08-19T21:04:38Z","closed_at":"2018-01-31T03:57:55Z","author_association":"NONE","body":"**Do you want to request a *feature* or report a *bug*?**\r\nReporting a bug.\r\n**What is the current behavior?**\r\nUnexpected DOM elements in list rendering\r\n**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem. Your bug will get fixed much faster if we can run your code and it doesn't have dependencies other than React. Paste the link to your JSFiddle (https://jsfiddle.net/Luktwrdm/) or CodeSandbox (https://codesandbox.io/s/new) example below:**\r\nhttps://jsfiddle.net/tse5xcg5/1/\r\njust switch the tabs, there are unexpected DOM elements\r\n**What is the expected behavior?**\r\nno unexpected DOM elements\r\n**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**\r\ntested with React >= 16\r\nno extra elements with React 15\r\n\r\n\r\nDuplicate keys are mistakes, but these DOM elements should not be there anyway."},"comment":{"url":"https://api.github.com/repos/facebook/react/issues/comments/522753257","html_url":"https://github.com/facebook/react/issues/12124#issuecomment-522753257","issue_url":"https://api.github.com/repos/facebook/react/issues/12124","id":522753257,"node_id":"MDEyOklzc3VlQ29tbWVudDUyMjc1MzI1Nw==","user":{"login":"jspinella","id":6296186,"node_id":"MDQ6VXNlcjYyOTYxODY=","avatar_url":"https://avatars0.githubusercontent.com/u/6296186?v=4","gravatar_id":"","url":"https://api.github.com/users/jspinella","html_url":"https://github.com/jspinella","followers_url":"https://api.github.com/users/jspinella/followers","following_url":"https://api.github.com/users/jspinella/following{/other_user}","gists_url":"https://api.github.com/users/jspinella/gists{/gist_id}","starred_url":"https://api.github.com/users/jspinella/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jspinella/subscriptions","organizations_url":"https://api.github.com/users/jspinella/orgs","repos_url":"https://api.github.com/users/jspinella/repos","events_url":"https://api.github.com/users/jspinella/events{/privacy}","received_events_url":"https://api.github.com/users/jspinella/received_events","type":"User","site_admin":false},"created_at":"2019-08-19T21:04:38Z","updated_at":"2019-08-19T21:04:38Z","author_association":"NONE","body":"For anyone else who stumbles across this issue... \r\n\r\nUsing the latest version of React 15, the first element with each key is rendered, the rest are ignored, and there is no error logged to console.\r\n\r\nUsing the latest version of React 16, all elements are rendered regardless of how many share the same key, AND an error is logged to console complaining about duplicate keys.\r\n\r\n\r\nAs @aweary mentioned, this behavior can and did indeed change with the latest version of React.\r\n\r\n"}}
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