Audio here at 0’36 (measure 20)
It seems to feature a Neapolitan sixth chord (which follows its applied dominant) and an applied Fr+6.
Don’t hesitate to share your thoughts or correct any mistakes :)
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It’s cool that the soprano line implies a sequence of V-I relationships but the harmonization is funky. You could argue that the first chord is really a V7(♭5) in second inversion. And the third chord in your analysis should be V4/2/IV, which makes a deceptive resolution to the N6/4.