ZFS and ZPOOL disagree about space usage

<!-- Please fill out the following template, which will help other contributors address your issue. --> <!-- Thank you for reporting an issue. *IMPORTANT* - Please check our issue tracker before opening a new issue. Additional valuable information can be found in the OpenZFS documentation and mailing list archives. Please fill in as much of the template as possible. --> ### System information <!-- add version after "|" character --> Type | Version/Name --- | --- Distribution Name | arch Distribution Version | current Kernel Version | 6.6.140 Architecture | x86_64 OpenZFS Version | 2.3.4 <!-- Command to find OpenZFS version: zfs version Commands to find kernel version: uname -r # Linux freebsd-version -r # FreeBSD --> ### Describe the problem you're observing ``` zpool list rpool; zfs list rpool NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT rpool 3.62T 1.77T 1.85T - - 37% 48% 1.00x ONLINE - NAME USED AVAIL REFER MOUNTPOINT rpool 7.62T 1.74T 96K none ``` does not exactly line-up and this just doesn't make sense: ``` scan: scrub in progress since Sat May 23 15:16:26 2026 3.98T / 1.84T scanned at 15.1G/s, 462G / 1.82T issued at 1.71G/s 0B repaired, 24.74% done, 00:13:41 to go ``` ### Describe how to reproduce the problem I'd love to know this as well ### Include any warning/errors/backtraces from the system logs <!-- *IMPORTANT* - Please mark logs and text output from terminal commands or else Github will not display them correctly. An example is provided below. Example: ``` this is an example how log text should be marked (wrap it with ```) ``` --> None yet by my spidey sense says "this is probably not good"