Video embeds disappeared when updating WordPress template, what happened?

Question

WordPress

Here is the old template: esk.bookreev.com/video/ekspluatiruemaya-krovlya-...
There is a video There is a
new template on the original site.
Same page: esk.ru/video/ekspluatiruemaya-krovlya-gidroizoly...
No video insert
How so? What could happen?
screenshot in the old editor:

Answer 1

Look in the old template for a file that will contain the line youtube_video_id. This will be the place where they get the video id for processing and output.