How to make some sense out of backup run output errors

[hput]

I ran a replication backup just on rpool of ssh-server host and received a error that I don't know what to make of.
On the backup server:
I created p0/rep/2x each segment with zfs set canmount=noauto
I ran: zfs set autobackup:localsnpr=true rpool

Followed by:
zfs-autobackup -v --clear-mountpoint --ssh-source 2x localsnpr p0/rep/2x
I've included the output from the run in attached log.
I marked only the rpool of ssh-server then ran: as above.

A small bit of the error is extracted below:
[...]

Synchronising

[Target] p0/rep/2x/rpool@localsnpr-20220524191926: receiving full
! [Target] STDERR > internal error: Invalid argument
! [Target] STDERR > /bin/sh: 2031: Abort(coredump)
! [Target] Command "zfs recv -u -o canmount=noauto -v -s p0/rep/2x/rpool" returned exit code -6 (valid codes: [0])
! [Source] rpool: FAILED: Last command returned error
[Target] p0/rep/2x/rpool/ROOT@localsnpr-20220524191926: receiving full
[Target] p0/rep/2x/rpool/ROOT/ubuntu_h55lfy@localsnpr-20220524191926: receiving full
[...]
I don't know what I'm looking at but:
Looks to me like the error occured in the `rpool' segment; and had something to do with line 1031
of a sh script ... what script?

output.log