<p>The same thing happens with valid links though (assume you mean those with a file extension).<br>
<a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/16965772/71765122-95e00b80-2ee8-11ea-8a21-160f28152fe0.png"><img src="https://user-images.githubusercontent.com/16965772/71765122-95e00b80-2ee8-11ea-8a21-160f28152fe0.png" alt="Screenshot_2020-01-04 Way 488123069 OpenStreetMap" style="max-width:100%;"></a></p>
<p>There isn't a problem when the custom url is the final item in the list. I wonder if spaces after the semi-colon would help?</p>
<p>Or does the custom url need to be turned into a hyperlink at all?</p>
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