Mariabackup doesn't create xtrabackup_checkpoints file

Hi, I've scheduled mariabackup to create one full backup per week and an incremental backup every 3 hours in stream mode. Often, mariabackup tool doesn't create xtrabackup_checkpoints and xtrabackup_info failing entire process.

This is the command for the incremental:
mariabackup --backup --stream=mbstream --incremental-basedir=/backup/mariadb/base/full1 --user=mariabackup --password=******* --extra-lsndir=/backup/mariadb/incr/full1/incr1 | gzip > /backup/mariadb/incr/full1/incr1/backup.stream.gz

What's wrong?