Gallery fails, but same playlist works

On my local development environment, this short tag:

[embedyt] https://www.youtube.com/embed?listType=playlist&list=PLKQGh_Y_OUiw4Qk3DfZyqZipFjR8CdgAc&layout=gallery[/embedyt]

…causes Firefox to fail to load the page with the error:

NS_ERROR_NET_PARTIAL_TRANSFER

…and Chrome to fail to load the page with the error:

ERR_INCOMPLETE_CHUNKED_ENCODING

…but it works fine if I remove the “&layout=gallery” from the end of the URL.

I tried deactivated all of the other plugins except for Advanced Custom Fields Pro because it is required to load the page, but it didn’t help. If I leave Yoast active, Firefox won’t get to the error and instead shows this error:

Secure Connection Failed

An error occurred during a connection to dev.manhattan-law.com.

The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
Please contact the website owners to inform them of this problem.

…but the site and that page work fine as long it’s not using the gallery layout.