w3-fixed causes jumping on chrome

Problem:
If the viewport is enough to allow scrolling on chrome, but not enough to properly invoke .w3-fixed, then the page ends up jumping back to the top in an endless bounce when you scroll down. Simply resizing the window will allow the problem to occur.

Proposed Solution:

.w3-fixed {
  position: sticky;
}

It would actually be better to rename the class to w3-sticky since I can't seem to find w3-fixed in the spec, so I'm guess it's a made-up class for this theme?