MewBot is acting odd
No, that's intended. Since the inflection table already shows these forms even when collapsed, showing them also in the headword line is redundant.
That makes sense -- but then I think there ought to be some kind of parameter to set in the nl-verb template so it doesn't show the [please provide] text in the headword line, now it just ends up looking incomplete.
In case you have Greek terms in your sights - forms are shown in the HWL that appear in Greek dictionaries (eg the feminine & neuter forms of adjectives). In most cases they tell you all you need in order to 'get' the paradigm. When viewed on a computer these forms may be superfluous, but when viewed on a mobile telephone they make it unnecessary to view the whole table which with some terms may exceed screen width. I would request that the HWL are not changed.