I cannot figure out why this happens. I don't think its a bug, but it doesn't seem to happen with other custom blocks. Help is appreciated!
I think it is a slight bug that applies to any custom block with variadic slot
I did some comparisons down in the engine room and I think defaults is returning a one item list with a null value whereas other options like separators are returning a one item list with an empty string value.
Mapping over the result is a simple workaround for the moment
