What happened to custom attribute curves?

In 5.2 I could import an FBX character which had custom attributes associated with the root bone, and these attributes would appear as curves on the skeleton.

However, in 5.3 and 5.4 when importing the same FBX file, I do not get these custom attribute curves on the skeleton. I only get the morph and material curves.

Is this bugged in 5.3 and 5.4 or is it by design?

Thanks

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Does anyone know anything about this?

Surely I can’t be the only person to use attribute curves in UE.