About 'Reconstruction:Proto-Germanic/libjaną'

The problem was not so much that you included the Germanic verb, but where you included it. You placed it under the derivation of a root present verb, while this is definitely not a root present verb. I'm not entirely sure about the formation for the moment, but it's fine if you include it under "unsorted formations" on its own line. Then someone else can place it somewhere better later, if they know where it goes.