sitespeedio reporting LCP element incorrectly in the docker version

Have you read the documentation?

• Yes, I've read the how to make a reproducable bug guide
• Yes, I've read the how to debug my script guide

URL

https://uk.puma.com/uk/en

What are you trying to accomplish

• Noticed that LCP element is tracked incorrectly while running tests against this page with a video element on viewport (https://uk.puma.com/uk/en) - but only while using the docker version.

• While using the sitespeedio native app, can see the LCP element is identified correctly - which is the hero video on the view port. Attaching results from this test: sitespeedio-test-native-results.zip

• Performance tab on Chrome browser also reports the same as LCP element, as expected.
  

• Whereas the sitespeedio docker version apparently tracks LCP element incorrectly! It seems to be not loading the video element correctly and probably causing the LCP element to be tracked incorrectly.
  Attaching results from this test: sitespeedio-test-docker-results.zip.

• Same config file was used to run the tests on both cases: config_mobile.json

What browser did you use?

Chrome

How to reproduce

- Please run test against URL `https://uk.puma.com/uk/en` using the config file attached above.

- Commands used:
-- native app: 
sitespeed.io --config config_mobile.json https://uk.puma.com/uk/en

-- docker: 
docker run --shm-size=2g --rm -v "$(pwd):/sitespeed.io" sitespeedio/sitespeed.io:37.4.1 --config config_mobile.json https://uk.puma.com/uk/en

Log output

Reproduce the page with config_mobile.json using both the native command and the sitespeedio/sitespeed.io:37.4.1 Docker command, then compare the reported LCP element and attached results. Done means the Docker run identifies the hero video consistently with the native app and Chrome Performance results.