Why is a later added (co-)supervisor not listed under Individual assessment of manuscript by supervisor(s)?

The individual assessments are not updated until the promotion request is made. So the fact that the person is not visible in the individual assessments is not a problem here.

As soon as the next step in the process is taken, the individual assessment will become visible.

The Hora Finita supplier reports that it is not desirable to organise this earlier because of the load on the HF system.