`jbundle tree` generates a flat tree when Jarfile.lock is present

[satyanash]

I'm having an issue where I need to zero down on which jar is bringing in a specific transitive dependency. Whenever I run jbundle tree, all I get is a flattened out tree which very closely resembles what is present in the Jarfile.lock.
It also appears that deleting the Jarfile.lock and then running jbundle tree seems to solve this and I get what looks much more like a proper dependency tree as it should be.

This seems like a bug?

Ruby version: jruby 9.2.6.0 (2.5.3) 2019-02-11
jbundler version: jbundler (0.9.3)