24.10 RC2 Raidz expansion caused miscalculated available storage

no, all of my content has such a discrepancy
image
these are all remuxes, from either blu-ray disks or 4k UHD blu-ray disks.

(yes, lawrence of arabia UHD does come on 2 disks, and I did stitch them together with mkvtoolnix, but that was well before I did any zfs expansion - I chose it because it was the largest file I had.)