There no longer exists an inner Document#data object. Any code which references this data object will now generate console logged warnings and have their request redirected to the root level of the Document.
Old:
const name = actor.data.name;
const trueName = actor.data._source.name;
New:
const name = actor.name;
const trueName = actor._source.name;
See: https://foundryvtt.com/article/v10-data-model/
sbcUtils.js: