Editing start time of group time segment creates additional set of object properties

I have created a group of objects. The group has some time segments. When I edit the start time of one time segment in the timeline editor to start earlier, the group objects show different property values for the new added time. The added property values are old values I used in the past. So the modified extended single time segment behaves as two time segments with two different sets of properties for the objects in the group. This is annoying as I have to manually correct one property set to match the second property set in the segment.

Workaround: Instead of editing a time segment to start earlier, let all other objects in the project start at a later time. Then the video is black for the first seconds in the beginning which can be cut away later.