Vue warnings in dev when creating a new configuration with boolean fields

Found while testing !1552 (merged):

[Vue warn]: Property "fieldLabel" was accessed during render but is not defined on instance. 
  at <BooleanField key=0 field= 
Object { type: "bool", title: "training setup | whether to use dynamic distortions to augment the training data", default: false, required: false }
 field-id="training__train__augment_training"  ... >