If I double-click a word in NA27, either the copy with apparatus or with the morphology, then it looks up in BDAG the correct root word. This also works in the UBS4 with morphology.
However, if I double-click in the UBS4 with apparatus, it doesn't look up the root word and goes to one of the Lexham volumes instead.
Why does the UBS4 with apparatus not behave the same as the NA27 with apparatus?