Video doesnt work if using exact seconds

Read the discription ??

You can also start and end each individual video at particular times. Like the above, each option should begin with ‘&’

start – Sets the time (in seconds) to start the video. Example: https://www.youtube.com/watch?v=quwebVjAEJA&width=500&height=350&start=20
end – Sets the time (in seconds) to stop the video. Example: https://www.youtube.com/watch?v=quwebVjAEJA&width=500&height=350&end=100

Using : &start=20 tags

@kangarooo,
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