Robot.txt issue. Contain HTML markup

[Shanyb]

Description

The generated robot.txt file contains HTML markup.
Google doesn't seem to like it and generates an error.

Error – Use of incorrect syntax (line 1)

Generated robot.txt file

Sitemap: https://inis.qc.ca/sitemap.xml
User-agent: *

Disallow: /cpresources/

Disallow: /lms/

Disallow: /assets/secure

Additional info

• Craft version: Craft Pro 3.7.44
• SEO version: 3.7.4
• PHP version: 7.4.33