It’s probably a side effect of this change in 2.0 pb4:
Tab key doesn’t make the path/URL/comment column editable anymore
I’d requested that before realizing the original behavior was Apple’s fault, as discussed at the end a Bruji Forum thread. Conor’s comments are worthwhile.
DTech might want to reverse this change, at least for the sake of cross-app consistency. And hopefully Apple eventually allows ESC to cancel accidental Tab-invoked edits.