"Use already rolled initiative" does not work properly in a edge case.

Core: 10.191
System: dnd5e 2.1.5
Group Initiative: 2.1.2

1) Having "Use already rolled initiative" enabled
2) Assuming that all the fighters I will mention in the next steps are descended from the same Actor
3) Relating to an already started fight in which there is only one fighter
4) If I enter any number of new fighters

THEN

The "Use already token initiative" option does not work.