OCI: Extending the First Partition of the Disk Fails with Error "it cannot be grown"

Symptoms:

Disk has been extended at OCI Console Level by referring to the document.

The new disk size is available at OS level after rescan.

[root@ ~]# dd iflag=direct if=/dev/sdb of=/dev/null count=1
[root@ ~]# echo "1" > /sys/class/block/sdb/device/rescan
[root@ ~]# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sdb      8:16   0   80G  0 disk          
├─sdb2   8:18   0   40G  0 part /mystuff2

└─sdb1   8:17   0   25G  0 part /mystuff1

While growing the first partition, this error message is noticed.

[root@ ~]# growpart /dev/sdb 1
NOCHANGE: disk=/dev/sdb partition=1: size=52428800, it cannot be grown      

Cause:

Growing the first partition is NOT possible because there are no sectors available between first and second partition.