I am using
Band-in-a-Box® for Windows
Version 2022 (922)
64 bit application

At the end of the last chorus when there's a tag, instead of jumping to the tag BiaB plays bar #1, then the bar after the tag.

I think the bug is something like: When the 'jump to tag' condition is detected, the song, for that one bar, jumps to bar 1, which may be a default initial condition. Then after that bar, which would be a special case, things work as expected. There's a tiny bug in that special case that inadvertently sets the "next bar" to 1, or neglects to set it at all so the initial value is not updated.