The nbtree README claims that VACUUM can never finish interrupted page
splits by design.  That isn't entirely accurate, though.  Note an
exception to the general rule.

Discussion: https://postgr.es/m/CAH2-Wz=_Xvv8byzK_LvY4ci76OgsHCQzoKF7We8yG9waO7j6rA@mail.gmail.com