UserList listType is null

Hey guys -

I'm just starting to familiarize myself with UserLists & to that end, the first thing I did was just retrieve all UserLists for a couple of accounts & print out all their attributes. I had a significant number of instances returned with a null listType and the UserListType set to "User List". Is this expected? If so, what are these and why don't they have a specific list type? This is using the java client (2.7.0).

Thanks a bunch -

mm

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