Inconsistent opacity within highlight

When highlighting math equations, the highlight sometimes looks like it is composed of several regions (even though it is a single highlight). Where the regions appear to overlap, the highlight is darker, looking as if those regions were highlighted twice.

See the below example in zotero (6.0.23) vs. evince:

zotero: https://postimg.cc/N2KxwJwz
evince: https://postimg.cc/KRg5qHfK

The iOS app also exhibits the same problem.
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