Add anchor to only specific sections

[johndp]

Description

Added a data-anchor attribute to one of the section (no data-anchor to other sections), when scrolling to the said section with data-anchor, the navigation bullet doesn't set to active/current state.

Link to isolated reproduction with no external CSS / JS

https://jsfiddle.net/67x4tr10/

This issue is similar to this: #4037

[alvarotrigo]

Anchors should be added to all sections or none of them.
You can't add it only to one single section.

I'll mark this as a possible enhancement for future versions.