On the header block when using the video option on a Spanish site the video doesn't work

[SophieAmnesty]

Describe the bug The header block has the option to change the 'background type' to video, rather than image. This feature doesn't seem to work in the Spanish site. You can add the video but it doesn't show up on the front end.

To Reproduce Steps to reproduce the behavior:

1. on a Spanish language site
2. create a post, add header block
3. select 'background type' video and add a video and a featured image
4. preview post - can't see the video! just the image shows.

Expected behaviour video feature should work on the header block - across all languages.

Actual behaviour It worked on amnesty.org/en but not on amnesty.org/es.

Link to a page where the bug is reproduced in isolation https://isaidotorgstg.wpengine.com/es/latest/news/2024/01/test-header-block-video-spanish/ https://isaidotorgstg.wpengine.com/en/latest/news/2024/01/test-header-block-video-spanish/

Which site is this happening on amnesty.org

Link to a page in the documentation site where the feature is described https://wordpresstheme.amnesty.org/blocks/b000-header/

Desktop (please complete the following information): https://www.whatsmybrowser.org/b/EPIA9

Additional context Issue came up from a translator working on this page: https://www.amnesty.org/es/latest/news/2024/01/united-states-lives-devastated-and-human-rights-sacrificed-by-toxic-fossil-fuel-related-pollution-from-petrochemical-plants-in-texas-and-louisiana/

I think it was also previously an issue on this page: https://www.amnesty.org/es/latest/news/2023/09/drc-cobalt-and-copper-mining-for-batteries-leading-to-human-rights-abuses/

[AmnestyAM]

interesting, we recently had another ES on bug on the collapsible block amnestywebsite/amnesty-wp-theme#2785

[Gentyspun]

No longer able to replicate locally or on staging environment.

CC @AmnestyAM