SD resizing fails on the N900 on v21.03

Tested this image on the N900: http://images.postmarketos.org/bpo/v21.03/nokia-n900/i3wm/20210329-0132/20210329-0132-postmarketOS-v21.03-i3wm-0.3-nokia-n900.img.xz

The image boots fine, the console output mentions the SD is resized but it actually doesn't resize and the graphical environment doesn't start because there's 0 bytes remaining on the rootfs after trying and failing to create a swapfile