This happens when different staves have different sizes, giving the bar lines different thickness. There are some strategies to deal with it in the bottom of this manual page:
HTH
/Leo
5 mars 2024 kl. 13:06 skrev Johannes Roeßler <joei@joei.de>:
Hi Guys,
is there a way, to get rid of the staff lines exceeding the final bar line?
And if this isn't a bug - is there a reason to make it like this?
\version "2.24.0"
<<
{a'1\bar "|."}
{\magnifyStaff #(magstep -3) a'4 4 4 4}
>><MZBjjdSNXDHCyPVM.png>Best regards
Joei