Colorbar won't update when data changed, is that a bug?

Dash Python
1

I have a Parallel Coordinates plot that uses color bar to help distinguish lines. There are a few dropdowns to let users select specific conditions to filter out the dataframe. The initial plot looks great and the filtering works, the problem is that the color bar DO NOT update after filtering. The tow screenshots below shows the issue, the first plot is the initial state with data range from -46.124 to -21.427 and the color bar is right; the second pot is with filtering and the data range changed to (-46.124, -32.268), however, the color bar doesn’t change accordingly.

InitialColorScaling
InitialColorScaling.png1920×570 302 KB

AfterFilteringColorScaling
AfterFilteringColorScaling.png1920×570 135 KB

2

Here is the code snippet:

app.callback(Output('plotDiv', 'children'),
             [Input('filters', 'children'),
              Input('xaxes', 'value'),
              Input('yaxis', 'value')],                 
             [State('Id', 'children')])
def PPlot(f, x, y, Id):                
    df = getDF(Id[0])        
    filters = json.loads(f[0]) if f else {}
    for k, v in filters.items():
        df = df[df[k].isin(v)]
    df = df[x]        # only keep columns that's in list x
    fig = px.parallel_coordinates(df, color=y, labels={_:_ for _ in x},
                            color_continuous_scale=px.colors.sequential.Rainbow,
                            color_continuous_midpoint=None)         
    return Graph(figure=fig)