Morrison is currently getting sky-high approval ratings after Australia's relatively sure-footed approach to tackling coronavirus - if the coalition lose here despite that, might it worry them a bit?
FWIW it's extremely rare for the party in government in Australia to flip a seat in a by-election, so it wouldn't be a special electoral indictment. However, I do find it interesting that the two party preferred vote in polling is stuck at 51-49 LNP despite Morrison's sky high favorables.
What polls are you referring to?