Same problem here:
acf.getField('teilnehmer', this.props.selectedPostId, false);
results in:
$el: a.fn.init [selector: "", prevObject: a.fn.init(0), context: document]
cid: "acf28"
data: {}
__proto__: acf.Model
“data” being an empty object.
so, is this a bug or what did i miss?