Recent version 7.29.0 raises 'Missing "key" prop for element in array react/jsx-key' unnecessarily; breaks build

[martha-anne]

When using version 7.29.0 in my webapp and running a build I am seeing thousands of 'Missing "key" prop for element in array react/jsx-key' errors which seem to be raised for every file, against lines which do not involve arrays at all. It appears to be raised any time an element contains any other element.

Versioning down to 7.28.0 fixes the issue.

Example

src/ui/components/resourceVideo/ResourceVideo.tsx
  Line 17:7:  Missing "key" prop for element in array  react/jsx-key
  Line 17:7:  Missing "key" prop for element in array  react/jsx-key
  Line 18:7:  Missing "key" prop for element in array  react/jsx-key
  Line 18:7:  Missing "key" prop for element in array  react/jsx-key

ResourceVideo.tsx:

import React, { FC, useRef, useState } from 'react';

import './ResourceVideo.sass';
import VimeoVideoPlayInModal from '../vimeoVideoPlayInModal/VimeoVideoPlayInModal';

type Props = {
  videoUrl: string;
  videoTitle: string;
};
const ResourceVideo: FC<Props> = ({
  videoUrl,
  videoTitle,
}: Props): JSX.Element => {
  return (
    <div className="resource-video">
      <VimeoVideoPlayInModal videoUrl={videoUrl} />
      <h3>{videoTitle}</h3>
    </div>
  );
};

export default ResourceVideo;

[Fox32]

See #3215

[yoyo837]

Duplicate of #3215

[ljharb]

Duplicate of #3215.

[ljharb]

v7.29.1 is released.