🇺🇸United States @EricB1021

I haven't run into this on D11, but several times on D10.

As a work around, in propertyDefinitions() create the property as $type = 'any'.
e.g.
$properties['item'] = DataDefinition::create('any')
->setLabel(t('Item Label'))
->setDescription(t('... Item description ...'));

Then in schema() you can set your data type to what you need, instead of doing what mfb had to do.