CKS Mock Exam 1 question 3 - the checker doesn't work

[ppb]

This is a similar issue as CKS Mock Exam 2 question 6 - how is the line validated?

Record the filenames containing issues in /opt/course/security-issues.txt .

My output is

$ cat /opt/course/security-issues.txt 
q3_file1.Dockerfile
q3_file2.yaml

so just a single empty line fails the check

[Santosh_KodeKloud]

Could you please try this again?
I tried the lab, and it did work fine at my end.