toWidget method of a custom converter is not executed

[holdenhao]

I am using Plone 6.0.15 ClassicUI and DGF 3.0.4. My custom converter for my schema.Decimal field is not being triggered in display mode.

My DictRow schema:

class IOrderDetails(model.Schema):

    order_category = schema.Choice(
        title="Category",
        vocabulary="srstims.common.OrderCategory",
        required=False,
    )

    directives.widget("amount", DecimalCurrencyTextFieldWidget)
    amount = schema.Decimal(
        title="Amount",
        required=False,
    )

My converter:

@adapter(IDecimal, IDecimalCurrencyTextWidget)
class DecimalCurrencyTextDataConverter(BaseDataConverter):

    def toWidgetValue(self, value):
        if value is self.field.missing_value:
            return ""
        return str(value)

The converter works on regular schema fields but not if it is used in DGF.