Mariadb-backup 10.11.15 failed, the same like 10.11.11 try increasing innodb_log_file_size

MariaDB backup 10.11.15 failed the same like 10.11.11. It worked for 6 days and the same issue appeared:

[01] 2025-12-20 09:50:41 ...done
[00] 2025-12-20 09:50:41 Finished backing up non-InnoDB tables and files
[00] 2025-12-20 09:50:41 Waiting for log copy thread to read lsn 136050492604135
[00] 2025-12-20 09:50:46 Was only able to copy log from 136050286200493 to 136050492368222, not 136050492604135; try increasing innodb_log_file_size
mariabackup: Stopping log copying thread.............................................................

The backup script does this:

mysql -e 'SET GLOBAL innodb_max_dirty_pages_pct_lwm=0.01;'
sleep 10

/bin/mariadb-backup --backup --target-dir=/mnt/backup/west/dbbackup_daily/"$BACKUP_DAY"/ --user=root --password=pass

sleep 1
mysql -e 'SET GLOBAL innodb_max_dirty_pages_pct_lwm=5;'