Wow! TIL! I've been running a for loop around the two ordering variations to catch the winner of each turn and the difference is quite noticeable. In the options-after-body case in 47 of 100 attempts it classifies as phishing, whereas in the options-before-body case it classifies clearly as rickroll (94 out of 100 attempts)

Payroll sends you an email with a link to a Youtube video that plays a song.

Options after body:

    Average probabilities:
    Rickroll   0.5158 ( 51 wins)
    Phishing   0.4561 ( 47 wins)
    Spam       0.0281 (  2 wins)
    Joke       0.0000 (  0 wins)
    Legitimate 0.0000 (  0 wins)

    Average probabilities:
    Rickroll   0.9293 ( 94 wins)
    Joke       0.0549 (  5 wins)
    Phishing   0.0140 (  1 wins)
    Spam       0.0018 (  0 wins)
    Legitimate 0.0000 (  0 wins)

EDIT

Gemma4-12B-it-NVFP4 seems way less sensitive to option/body ordering:

Options after body:

    Average probabilities:
    Rickroll   0.9867 ( 99 wins)
    Phishing   0.0133 (  1 wins)
    Joke       0.0000 (  0 wins)
    Spam       0.0000 (  0 wins)
    Legitimate 0.0000 (  0 wins)

    Average probabilities:
    Rickroll   0.9401 ( 93 wins)
    Phishing   0.0336 (  3 wins)
    Spam       0.0250 (  4 wins)
    Joke       0.0010 (  0 wins)
    Legitimate 0.0002 (  0 wins)