**Steps to replicate the issue** (include links if applicable):
* Visit a diff page with safemode on (or off), such as https://en.wikipedia.org/w/index.php?title=Wikipedia:Sandbox&diff=prev&oldid=1227609467&safemode=1
* Ensure the toggle is in block diff mode
**What happens?**: a black circle displays over the moved lines. It goes away when hovered.
{F54979457}
**What should have happened instead?**: Should not display.
**Software version** (on `Special:Version` page; skip for WMF-hosted wikis like Wikipedia):
**Other information** (browser name/version, screenshots, etc.):
A similar issue also occurs with inline actually, except they're small blue triangles?
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Related link: https://en.wikipedia.org/wiki/Wikipedia:Village_pump_(technical)#It's_Thursday,_6_June_and_I_have_spots_before_my_eyes