The current GetClassDefaults is overly restrictive in what it allows to be modified and not. Object properties that point outwards (i.e. non-instanced) should be accessible.
Try to get at a basic data asset reference using GetClassDefaults node.
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-67227 in the post.
|Component||Gameplay - Blueprint Editor|
|Created||Dec 5, 2018|
|Updated||Dec 6, 2018|