The terminal is not combing Unicode characters correctly. How do I solve this?
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GNOME Terminal version 3.32 (more precisely, the underlying VTE version 0.56) addresses this issue, you should no longer see those circles.
A known issue is that the character under the solid block cursor still potentially draws such a circle. This is quite hard to fix (I'm also unsure what the exact desired behavior is). A possible workaround is to switch to I-beam or underline cursor shape.