TrackChanges are not correct on taking over TM match

We assume the following Segments:

When we edit the segment, we get the following two matches from the TM:

On overtaking one of the matches, the TrackChanges Markup in the editor is:

This is not correct, since only the text content after the already existing trackchanges markup is marked as deleted.

If we edit the first segment (without existing markup) the overtaking is correct: