Reproduced. it actually DOES add a project ref (i missed the title overlay in the screenshot coz the Yellow error covers it mostly ;); its just that the IDE/Build doesn’t resolve those yet (knows issue/limitation for now) and as i feared, xbuild doesn’t like them either (logged an issue to look into that asap)
On the one hand, glad you could reproduce. On the other, sorry. At least there is a way to make it work (Add Reference / Browse). Though that too can be confusing since you have to point to a jar file inside a Debug or Release folder, and it is not clear whether the IDE/tools will auto switch when the project changes build types…
Thanks,
Tyler
PS Downloading the latest Fire 9.2 gamma now. 
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it won’t no. that’s one of the downsides of not using a project ref.