As others have mentioned there is a known issue with native encryption and Syncoid. I’ve personally experienced the issue on TrueNAS Core, Debian 11, and Ubuntu 22.04. The only solution I have found is to abandon native encryption then create the pool on top of LUKS encrypted disks. I have seen no errors on the same disks when using LUKS.
There are two OpenZFS issues I follow hoping to see a fix some day: