This is kind of complicated

The tune is I'll Remember April. The tune starts with the _SAMBA_P style in the intro. After the intro, and 8 bars into the head, the style is changed to _JSWINGG marked as a B part.

But for the first chorus, the swing B section is played as if it's an A section with the bass playing in 2.

If I set the tune to _JSWINGG and make a style change at bar 2 to _SAMBA_P, the B section in the head plays correctly.