Before reporting an issue

[X] I have read and understood the above terms for submitting issues, and I understand that my issue may be closed without action if I do not follow them.

Area

docs

Describe the bug

Downstream always needs explicit anchors, never only implicit anchors

Version

main

Regression

[ ] The issue is a regression

Expected behavior

Downstream build should succeed

Actual behavior

Downstream build fails

How to Reproduce?

Pantheon logs

Anything else?

I'll create a PR