Rotation not executing when file size reaches certain threshold

I have the following configurations in /etc/logrotate.d/rsyslog:

/var/log/syslog
{
        rotate 7
        size 1G
        missingok
        notifempty
        delaycompress
        compress
        postrotate
          invoke-rc.d rsyslog rotate >/dev/null
        endscript
}

From what I understand, I've set it up so if /var/log/syslog reaches 1G in size, it will rotate itself. Also, the system will hold 7 rotations.

In testing, I did this:

cat /dev/null > /var/log/syslog
base64 /dev/urandom | head -c 999999999 > /var/log/syslog
logger -s "hello"

Then I did this:

ls -las /var/log/syslog*
976568 -rw-r----- 1 syslog adm 1000000072 Jul 28 19:11 /var/log/syslog

It's showing the file size as 1.000000728 GB shouldn't it have rotated itself?

When applying the configurations, I did systemctl restart rsyslog