[Bug] Broken `dash-ag-grid==35.2.0` for certain `dataTypeDefinitions` configuration

[petar-qb]

The following minimal reproducible example works fine with the dash-ag-grid==33.3.3, but it crashes with the latest dash-ag-grid==35.2.0.

import dash
from dash import html
import dash_ag_grid as dag
import plotly.express as px

df = px.data.iris()

app = dash.Dash(__name__)

app.layout = html.Div(
    [
        dag.AgGrid(
            rowData=df.to_dict("records"),
            columnDefs=[{"field": c} for c in df.columns],
            dashGridOptions={
                "dataTypeDefinitions": {
                    "number": {
                        "columnTypes": "rightAligned",
                    }
                }
            }
        )
    ]
)

if __name__ == "__main__":
    app.run(debug=True)

Here's what I get when I open the app with the dash-ag-grid==35.2.0:

Screen.Recording.2026-04-21.at.16.19.20.mov

I guess the bug is introduced with this PR -> #440, but not fully sure.

We in Vizro team would like to stay updated with the latest dash-ag-grid, but our default configuration for dag.AgGrid objects in Vizro contains the configuration from the example above. So for now, we're sticked with the dash-ag-grid=33.3.3.

Thanks in advance, and let us know if you need any further information or help 🚀