Is there something new about poppy seeds or drug tests that is making this happen? Back in the 90s this specific scenario -- claiming that a poppy see bagel made you pop positive on a drug test -- was listed in DoD drug testing manuals as an example of something impossible that a drug user would cite to try to explain a positive test result.
Poppy seeds are from opium poppies. There's a little bit of the plant's latex coating each seed. If you're feeling adventurous, go get the cheapest or most "natural" brand of poppy seeds you can find at the grocery store, a 4 or 8 oz package should probably be enough; shake them up with cold water in a Gatorade bottle for about 20 minutes, strain, and drink. (Or so I've heard.)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6513924/
Poppy seed bagel has hardly any poppy seed in it, like maybe 1 or 2 % by weight? You would have to eat a lot of bagels. Perhaps eating something that is 50% or more poppy seed would be different?
