Unnecessary space in lyrics suppresses highlighting of notes at the beginning of the system

In the edition linked below, there's a syllable encoded with an unnecessary space (e - in line 581).

https://verovio.humdrum.org/?file=https%3A%2F%2Fhumdrum.nifc.pl%2F15xx%3A663.krn

This causes several problems:

in MEI conversion lyrics attached to the note are divided into two syllables, as if it were an elision, but the second <syl> element has no value:

     <note xml:id="note-L581F7" type="placed" dur="4" oct="3" pname="g" stem.dir="up" accid.ges="n">
      <verse xml:id="verse-L581F8" n="1">
       <syl xml:id="syl-L581F8" type="repetition" con="b">
        <rend xml:id="r1bus119" fontstyle="italic">e</rend>
       </syl>
       <syl xml:id="syl-L581F8S2" type="repetition" con="d" wordpos="i">
        <rend xml:id="remmudf" fontstyle="italic" />
       </syl>
      </verse>
     </note>

This in turn is converted to SVG in similar way:

    <g id="verse-L581F8" class="verse">
     <g id="syl-L581F8" class="syl repetition">
      <text x="13820" y="67381" font-size="0px">
       <tspan id="r1bus119" class="rend" font-style="italic">
        <tspan id="tljarc2" class="text">
         <tspan font-size="405px">e</tspan>
        </tspan>
       </tspan>
       <tspan font-family="Leipzig" font-size="720px"></tspan>
      </text>
     </g>
     <g id="syl-L581F8S2" class="syl repetition">
      <text x="13820" y="67381" font-size="0px">
       <tspan id="remmudf" class="rend" font-style="italic" />
      </text>
     </g>
    </g>

For some reason, this empty syllable suppresses the highlighting of the first few notes in every system. As if there was an invisible shape covering the notation:

highlighting

When the space is removed everything works as expected.

humdrum-tools / verovio-humdrum-viewer

Unnecessary space in lyrics suppresses highlighting of notes at the beginning of the system #833