pmbootstrap v3 fails to create system images due to using setup-timezone wrong

For a few days now I've been unable to generate a systemd image due to the following error:

(029294) [10:20:42] (rootfs_shift-axolotl) % setup-timezone Europe/Amsterdam
setup-timezone stub from postmarketos-base-systemd
usage: setup-timezone -i TIMEZONE
(029294) [10:20:42] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
(029294) [10:20:42] NOTE: The failed command's output is above the ^^^ line in the log file: /home/bart/.local/var/pmbootstrap/log.txt
(029294) [10:20:42] ERROR: Command failed (exit code 1): (rootfs_shift-axolotl) % setup-timezone Europe/Amsterdam

It seems setup-timezone should be invoked with a -i parameter? Not sure why this suddenly breaks now, the last alpine-conf upgrade (which includes this script) has been in June.