

You can try adding
continue_on_error: true
to the scene action so it doesn’t kill the entire automation. Note that if later parts depend on this action then they’ll fail in weird ways. The best thing is to fix the Zigbee network so the device doesn’t drop off but I know that’s not easy.
YouTube blocks it. There are extensions to allow it (like Vinegar) but by default it’s blocked. Brave might work around YouTube’s block in the same way.