Inconsistent behavior of emphasis and strong

[tivie]

Input

pointer *ptr *thing

​pointer **ptr **thing

something _else _bla

something __else __bla​

Expected results

<p>pointer <em>ptr </em>thing</p>
<p>pointer <strong>ptr </strong>thing</p>
<p>something <em>else </em>bla</p>
<p>something <strong>else </strong>bla​</p>

or this:

<p>pointer *ptr *thing</p>
<p>pointer **ptr **thing</p>
<p>something _else _bla</p>
<p>something __else __bla​</p>

Actual result

<p>pointer *ptr *thing</p>
<p>pointer <em>*ptr *</em>thing</p>
<p>something _else _bla</p>
<p>something <em>_else _</em>bla​</p>

[tivie]

The correct output should be:

<p>pointer *ptr *thing</p>
<p>pointer **ptr **thing</p>
<p>something _else _bla</p>
<p>something __else __bla​</p>