PageSpeed Insights lists resources that are not listed when running Lighthouse locally

#### Provide the steps to reproduce
1. Run LH on https://www.warehousefashion.com using PSI: https://developers.google.com/speed/pagespeed/insights/?url=https%3A%2F%2Fwww.warehousefashion.com%2F

#### What is the current behavior?

Lighthouse within PSI lists three sources (``) of a `` tag under **Diagnostics** audits.

Audits listing the three videos:
* "Serve static assets with an efficient cache policy"
* "Avoid enormous network payloads"

```
…video/b5ca64ae-77db-4c07-85e1-b470c58e2ec5.mp4(cdn.static.amplience.net)
…video/e5b17128-6540-4641-8096-a940c001192b.mp4(cdn.static.amplience.net)
…video/6fde6ba8-75dd-42d7-8e22-6dae0e4c5bad.mp4(cdn.static.amplience.net)
```

#### What is the expected behavior?

Only one video should have been requested by the browser and listed within the Lighthouse report.

When running Lighthouse on local machine (macOS Big Sur) within Stable Chrome (89.0.4389.82) DevTools, only one video is listed:

```
…video/b5ca64ae-77db-4c07-85e1-b470c58e2ec5.mp4(cdn.static.amplience.net)
```

#### Environment Information
* Affected Channels: PageSpeed Insights
* Lighthouse version: 7.1.0
* Chrome version: 88.0.4324.202