Scroll jank after clicking go up button

[tymeart]

I'm using Chrome Version 79.0.3945.88, and I found that scrolling becomes janky and stuttering after clicking the arrow to return to the top of the page in the course contents. This scrolling behavior is only apparent in the course contents pages. When I navigate to other pages on the site ("About course", "FAQ", etc) after clicking the arrow button, scrolling is normal. Scrolling returns to normal on the course contents pages after refreshing.

[JuhQ]

Interesting, I can repeat the issue in https://fullstackopen.com/osa5/props_children_ja_proptypet

[marklaatikainen]

I think it relates to this issue gatsbyjs/gatsby#12520