Visualization of text inside <del>, alone or inside <subst>

[FLazzerini]

Inside the element <app>, inside <rdg>, the text written inside <del> is not visualized.
Example from Lucullus:

<app from="#Luc-001-38">
                  <rdgGrp type="lectio.sing" cause="contextInduced">
                     <rdg wit="#Chis">aetate</rdg>
                     <rdg wit="#Vat4">p<del>a</del>ietate</rdg>
                  </rdgGrp>
</app>

In the apparatus, at pietate, the eliminated text (the letter a) is not visible:

A similar problem problem is with the element <subst>.
Another example from Lucullus:

<app from="#Luc-001-43">
                  <rdg type="lectio.sing" cause="multiple" wit="#Matr"><subst hand="#Matr.hand.c">
                        <del rend="dotted">a</del>
                        <add place="above">ini</add>
                     </subst>micicias</rdg>
</app>

As you can see from the screenshot, the software detects that "something" is up with the reading (there's an unduly space inside the word), but it seems that it can only read what is inside <add>, not what is inside <del>.