Question EMBEDDED YOUTUBE THUMBNAILS ONLY SHOWS FOR SOME VIDEOS

[cbtisrael]

i have a podcast which i also show on youtube. i am using identical post templates for each episode, but only some of the embedded videos show a video thumbnail when loading the page.

for example, this post shows a thumbnail for the video:
https://
elementor.cbtisrael.co.il/2020/02/22/%D7%A4%D7%A8%D7%A4%D7%A7%D7%A6%D7%99%D7%95%D7%A0%D7%99%D7%96%D7%9D/
(here’s the embedded youtube video: youtube.com/watch?v=bfCaYU6cy9w)

while this post does not show a thumbnail for the video:
https://
elementor.cbtisrael.co.il/2020/02/24/%D7%91%D7%A8%D7%99%D7%90-%D7%91%D7%A8%D7%90%D7%A9-%D7%A2%D7%9D-%D7%93%D7%A8-%D7%90%D7%95%D7%94%D7%93-%D7%94%D7%99%D7%9E%D7%A0%D7%A2%D7%95%D7%AA-%D7%95%D7%99%D7%93%D7%90/
(here’s the embedded youtube video: youtube.com/watch?v=aXNgnPHtEQs)

why do some videos have a thumbnail and others don’t?