Well....
“Syrian air defenses” is a very broad statement. ** Could have been ** a state of the art Russian radar controlled SAM or MANPAD or
using the big sky - little bullet theory, they might have been unlucky enough to have run into a ZU-23-4 or -2 - an unlucky day on the job. AKA a magic bullet.
At least they got home.
From what the Times of Israel is saying, this is all Iranian.
Persians are no slouches, either.