Discovered 2021-06-01(?), watchOS 7.6
Fixed no
Description Sometimes a scroll indicator can appear on Apple Watch face, even though there is nothing scrolling there at the moment, and moreover there is nothing to scroll there at all. Rotating Digital Crown does nothing.
Workaround Open some application with a scroll view or just press Digital Crown to show applications list, scroll it to trigger the actual scroll view to appear, return back to watch face.

Details

Here’s how it looks like:

Apple Watch scroll indicator