No Hovertext/text/name in clickdata

I am having two graphs, with one of them hovertext is part of the click data, for the other one not.
I do not understand why. Hovertext and name also are correctly displayed when hovering over the points of the graph, but they are not present in the click data.
Anybody has any ideas what the differences between the two graphs are, and how I can get either hovertext, text, or name in the click data of the second graph?
I only need one of those, and the only one that works (custom data) does funnily enough not even work for the first graph.

    for i in classes:
        #subsetting the data by the class
        dat_class=dat.loc[dat[classifier_column]==i]
        #getting only the cells from that class
        cells=list(dat_class[identifier_column].unique())
        print('...of class ', i, '...')
        if testmode==True:        
            cells=cells[50:100]
        #append the current classes name to the titles of the plot

    #looping through the cells
        for c in cells:               
            #appending x, y data based on current cell to the list of traces
            fig.append_trace(trace=go.Scatter(
            #getting x values
            x=dat_class.loc[dat_class[identifier_column]==c][X_column],
            #getting y values
            y=dat_class.loc[dat_class[identifier_column]==c][Y_column],
            #getting unique ID
            hovertext=dat_class.loc[dat_class[identifier_column]==c]['unique_time']),

            row=int(rowlist[math.floor(r_i)]) , col=1)



            
        #adding 1 to the row indicator, so that every class will be 
        #plottet in a new row
        fig.update_yaxes(range=[min_y*1.05, max_y*1.05], row=int(rowlist[math.floor(r_i)]), col=1)
        fig.update_xaxes(range=[min_x*1.05, max_x*1.05], row=int(rowlist[math.floor(r_i)]), col=1)
        r_i+=1

    fig.update_layout(margin={'l': 40, 'b': 5, 't': 30, 'r': 40},
            height=row_n*375, width=750)
    fig.update_layout({'clickmode':'event+select'})


ClickData output returns:
{
  "points": [
    {
      "curveNumber": 76,
      "pointNumber": 51,
      "pointIndex": 51,
      "x": 256.3593756574,
      "y": -103.1261306744,
      "hovertext": "WC3_S421_E1_T52"
    }
  ]
}
    for i in list(image_info[2]['alt_cells'].keys()):
        fig.add_trace(go.Scatter(
                hovertext='hovertext',
                customdata=['customdata'],
                name='name',
                text=i,
                x=[image_info[2]['alt_cells'][i][0]],
                y=[abs((image_info[2]['alt_cells'][i][1]-y_C))],
                mode='markers',
                marker_opacity=0.5,
                #marker_colour='rgba(0, 0, 255, .9)',
                
                )
        )
    fig.update_layout(
            images=[
                    go.layout.Image(source=img,
                                    xref='x',
                                    yref='y',
                                    x=0,
                                    y=y_C,
                                    #using input image sizes as the
                                    #axes legnths for the graph
                                    sizex=x_C,
                                    sizey=y_C,
                                    sizing='stretch',
                                    opacity=1,
                                    layer='below')],
            #defining height and width of the graph                        
            height=750,
            width=750*aspect_ratio)
                  
    fig.update_xaxes(visible=False, range=[0, x_C])
    fig.update_yaxes(visible=False, range=[0, y_C])
    fig.update_layout({'clickmode':'event+select'})

ClickData output returns:
{
  "points": [
    {
      "curveNumber": 7,
      "pointNumber": 0,
      "pointIndex": 0,
      "x": 149,
      "y": 675,
      "customdata": "customdata"
    }
  ]
}

Adding to this very weird error:
Is there any way to display more data on hovering than just name, x, y coordinates and hovertext?
There is the option to add ‘text’, but it seems as you cannot display ‘text’ if you do have ‘hovertext’.

I know created another graph that actually displays both, hovertext and customdata in the clickdata.
So how does this work? can anyone explain to me what is going on with this?