Pillagers always have "unlinked" arms, even when not attacking. This is inconsistent with all the other illagers, as when they don't attack, their arms are "linked", similarly to actual villagers. A fix would be to either:

1. Unlink all illagers' and villagers' arms, or
2. Link the arms of the pillager when it is not attacking/targeting a village, which should be WAY easier to do than the former.