Relevant portion of the upstream changelog:
Release 2020c - 2020-10-16 11:15:53 -0700
Briefly:
Fiji starts DST later than usual, on 2020-12-20.
Changes to future timestamps
Fiji will start DST on 2020-12-20, instead of 2020-11-08 as
previously predicted. DST will still end on 2021-01-17.
(Thanks to Raymond Kumar and Alan Mintz.) Assume for now that
the later-than-usual start date is a one-time departure from the
recent pattern.