Incorrect bar numbering when using multi-bar rests

[AGBrown]

Thank you for the software, it's really fun to build with.

I've stumbled across this issue. Bar numbering is counted incorrectly if both staves in the grand staff use a multi-bar rest at the start - at least I think it's incorrect?

let me know if you need more info

%abc-2.1

X:0
T:Multi-bar rest test fail
%%barnumbers 1 % bar number every 1 bar, if bar no. is shown
%%measurenb 0 % measure numbers at first measure
%%score {R|L} % draw continued bar lines in a grand staff
M:4/4
L:1/4
V:R clef=treble
V:L clef=bass octave=-1
K:Cmaj
[V:R] Z2 | c4 | c4 |
[V:L] Z2 | c4 | c4 |
%
%%vskip 40
[V:R] "^<-- annotated as bar 4, but its bar 5"c4 | c4 | c4 | c4 |]
[V:L] c4 | c4 | c4 | c4 |]

X:1
T:Multi-bar rest test pass
%%barnumbers 1 % bar number every 1 bar, if bar no. is shown
%%measurenb 0 % measure numbers at first measure
%%score {R|L} % draw continued bar lines in a grand staff
M:4/4
L:1/4
V:R clef=treble
V:L clef=bass octave=-1
K:Cmaj
[V:R] z4 | z4 | c4 | c4 |
[V:L] z4 | z4 | c4 | c4 |
%
%%vskip 40
[V:R] "^<-- annotated correctly as bar 5"c4 | c4 | c4 | c4 |]
[V:L] c4 | c4 | c4 | c4 |]

[paulrosen]

Yes, definitely a bug. Thanks for the report.