clef change in grand staff does not persist to subsequent lines

[AGBrown]

Environment:

• abcjs 6.4.1
• tested on and occurs in both chrome (127.0.6533.120 (Official Build) (64-bit) (cohort: Stable) ) and firefox (Version 129.0.1, Build ID 20240812083845)

Issue:

As the title says, if you change clef in the following abc, then it does not persist on subsequent lines:

(expand for test abc).

%abc-2.1

X:0
T:Clef change test
%%barnumbers 1
%%measurenb 0
%%score {R|L}
%%stretchlast 1
Q:"Misterioso" 1/4=80
M:2/4
L:1/4
V:R clef=treble
V:L clef=bass
K:Gmaj
[V:R] x x/ G/ | G2 | G2 | G2 |
[V:L] x x/ z/ | C2 | C2 | C2 |
%
%%vskip 40
[V:R] G2 | G2 | G2 | G2 |
[V:L] C2 | C2 | C2 | [K:clef=treble] C2 |
%
%%vskip 40
[V:R] G2 | G2 | G2 | G2 |]
[V:L] C2 | C2 | C2 | C2 |]

Expected output

The clef change should persist on subsequent lines for the relevant stave.

(e.g. from abc2svg ):

(expand for example of expected rendered output).

Actual output:

The clef change does not persist for subsequent lines for the relevant stave.

(expand for actual output image).

As you can see, the treble clef is not persisted for the lower staff on the last line. There is also a difference in where the treble clef change is rendered, but I'm not sure this is important.

Other observations

• The key signature is correct for the original clef, not the one that the stave should have changed to
• Key signature changes are persisted to subsequent lines, just not clef changes.

(expand for full test tune).

%abc-2.1

X:1
T:Clef and key change test
%%barnumbers 1
%%measurenb 0
%%score {R|L}
%%stretchlast 1
Q:"Misterioso" 1/4=80
M:2/4
L:1/4
V:R clef=treble
V:L clef=bass
K:Gmaj
[V:R] x x/ G/ | G2 | G2 | G2 |
[V:L] x x/ z/ | C2 | C2 | C2 |
%
%%vskip 40
[V:R] G2 | G2 | G2 | [K:Dmaj] G2 |
[V:L] C2 | C2 | C2 | [K:Dmaj] [K:clef=treble] C2 |
%
%%vskip 40
[V:R] G2 | G2 | G2 | G2 |]
[V:L] C2 | C2 | C2 | C2 |]

(expand for rendered image).

[paulrosen]

Definitely a bug. Thanks for the report.