add_regions() doesn't add regions. It replaces previous regions with the same name.
add_regions() with the same region name as a region already present in the view will replace the existing regions, instead of adding to them (as the name implies).
>>> v = sublime.windows().active_view()
>>> v.add_regions('a', [v.full_line(v.text_point(133,0))], 'string', 'circle', sublime.HIDDEN) # A circle is added, in line 133
>>> v.add_regions('a', [v.full_line(v.text_point(137,0))], 'string', 'circle', sublime.HIDDEN) # The first circle is deleted and a circle is added to line 137
I was expecting to have two circles, one in line 133, one in line 137.
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