nodeFormat not working for Sankey Diagram

[JulienBacquart]

Describe the bug
Whatever string format you specify for 'nodeFormat' for a tooltip in a Sankey Diagram, gets ignored and the result is always the same.
'pointFormat' works correctly.
Additionally 'valueSuffix' gets ignored for the node, but works correctly for the links.

To Reproduce
Minimal none working example:

from highcharts_core.chart import Chart

data = [{
        'from': 'France',
        'to': 'Portugal',
        'weight': 5,
    }
]

# Set chart options
options = {
    'chart': {
        'inverted': False,
    },
    'title': {
        'text': f"Title",
    },
    'subtitle': {
        'text': f"Subtitle",
    },
    'tooltip': {
        'headerFormat': 'null',
        'pointFormat': 'Working: {point.weight} Working',
        # Not working 
        'nodeFormat': '{point.name}: {point.sum} not Working!!!',
        # Not working for Node
        'valueSuffix': ' working_suffix'
    },
    'series': [{
        # 'nodes': nodes,
        'data': data,
        'type': 'sankey',
        'name': 'Sankey demo series',
    }],
}

my_chart = Chart(options = options)
my_chart.display()

Expected behavior
The 'nodeFormat' would have a behavior similar to 'pointFormat'.

Your Environment:

• Windows 11
• Python 3.11.7
• Jupyter notebook Version: 7.0.6
• highcharts-core Version: 1.5.1

[JulienBacquart]

Hi,

I juste re-tested the minimal example provided with the latest version highcharts-core Version: 1.7.4
And the problem is still present.

If I do:

my_chart.to_js_literal()

'nodeFormat' is missing from the output.