Error on shape editing with dcc.Graph: Invalid property specified for object of type plotly.graph_objs.layout.shape.label: 'texttemplate'

[matt-sd-watson]

I use dash components in my Flask app to render shapes on a dcc.Graph figure input. Oftentimes, this involves appending a list of shapes to the graph using the formula below:

for center in center_list:
            center = region.centroid
            annotation = cluster_frame[cluster_frame['cell_id'] == mask_id]['cluster']
            if len(annotation) > 0:
                annotation = str(annotation.tolist()[0])
                # boundary[int(center[0]), int(center[1])] = mask_id
                shapes.append(
                    {'editable': False, 'line': {'color': 'white'}, 'type': 'circle',
                     'x0': (int(center[1]) - circle_size), 'x1': (int(center[1]) + circle_size),
                     'xref': 'x', 'y0': (int(center[0]) - circle_size), 'y1': (int(center[0]) + circle_size),
                     'yref': 'y',
                     'fillcolor': cluster_assignments[data_selection][annotation]})
        self.figure['layout']['shapes'] = shapes

In the example above, a series of circles are generated around centroids for objects in the graph.
This scheme generally works well, but occasionally there will be in the following error when calling go.Figure(self.figure):

Invalid property specified for object of type plotly.graph_objs.layout.shape.label: 'texttemplate'

When I evaluate the shapes, sometimes they have a strange property added to them:

{'editable': False, 'line': {'color': 'white'}, 'type': 'circle', 'x0': 763, 'x1': 779, 'xref': 'x', 'y0': 284, 'y1': 300, 'yref': 'y', 'label': {'texttemplate': ''}}

It appears that plotly will randomly generate the label portion of the shape dictionary with a blank text template, which causes an error. It seems to happen indiscriminately and without a discernible pattern.

By comparison, most shapes appear to have a valid dictionary structure:

{'editable': True, 'line': {'color': 'white'}, 'type': 'circle', 'x0': 796, 'x1': 812, 'xref': 'x', 'y0': 293, 'y1': 309, 'yref': 'y'}

[matt-sd-watson]

Pinging here to see if there were any updates on this. I am continung to receive this error and it prevents certain callbacks from firing properly, such as when I want to export the current canvas from dcc.Graph as HTML. For example, with the following shapes contained in my go.Figure:

print(fig['layout'['shapes'])

[{'editable': True, 'fillcolor': 'rgba(0, 0, 0, 0)', 'fillrule': 'evenodd', 'label': {'text': ''}, 'layer': 'above', 'line': {'color': 'white', 'dash': 'solid', 'width': 4}, 'opacity': 1, 'path': 'M243.25,230.44512195121953L288.9817073170732,158.18902439024393L299.9573170731707,141.72560975609758L302.7012195121951,130.75000000000003L299.0426829268293,117.03048780487805L287.1524390243903,101.48170731707317L271.6036585365854,94.16463414634147L250.5670731707317,92.33536585365854L181.96951219512198,106.0548780487805L167.33536585365857,103.3109756097561L128.9207317073171,80.44512195121952L117.03048780487805,77.70121951219512L111.54268292682927,80.44512195121952L100.56707317073172,113.3719512195122L98.73780487804879,168.25000000000003L103.3109756097561,183.7987804878049L118.85975609756099,203.00609756097563L156.359756097561,220.38414634146343L175.56707317073173,226.78658536585368L204.83536585365857,245.9939024390244Z', 'type': 'path', 'xref': 'x', 'yref': 'y'}, {'line': {'color': 'white', 'width': 2, 'dash': 'solid'}, 'type': 'line', 'x0': 0.9299999999999999, 'x1': 0.95, 'xref': 'paper', 'y0': 0.05, 'y1': 0.05, 'yref': 'paper', 'editable': True, 'label': {'text': ''}, 'layer': 'above', 'opacity': 1, 'fillcolor': 'rgba(0,0,0,0)', 'fillrule': 'evenodd', 'path': 'M243.25,230.44512195121953L288.9817073170732,158.18902439024393L299.9573170731707,141.72560975609758L302.7012195121951,130.75000000000003L299.0426829268293,117.03048780487805L287.1524390243903,101.48170731707317L271.6036585365854,94.16463414634147L250.5670731707317,92.33536585365854L181.96951219512198,106.0548780487805L167.33536585365857,103.3109756097561L128.9207317073171,80.44512195121952L117.03048780487805,77.70121951219512L111.54268292682927,80.44512195121952L100.56707317073172,113.3719512195122L98.73780487804879,168.25000000000003L103.3109756097561,183.7987804878049L118.85975609756099,203.00609756097563L156.359756097561,220.38414634146343L175.56707317073173,226.78658536585368L204.83536585365857,245.9939024390244Z'}]

I still receive this error:

Invalid property specified for object of type plotly.graph_objs.layout.shape.Label: 'texttemplate'

despite removing this key from the all of the shapes in the shape dictionary through the callback.