Second part of a clip has speed 0%, won't dissolve

I have a clip that is followed by a still and I want a cross dissolve. But whatever I do I can;t get the clip to do it. Here is the effect panel showing the entire clip (not zommed in) and you can see only the first part has that bar.

During the first part the clip has 100% speed, and after it has 0% speed. I have no idea why and I am unable to remove this. I can remove the clip, create a new one from Add Frame Hold, make it fit the gap, but as soomn as I try to create a cross dissolve with the next clip, I can see it tries, but it fails and afterwards the speed of my clip is 100% during the first part and 0% during the second. So, it seems to be a side effect of trying to create the dissolve.

I am pretty inexperienced (I do this once every 2 years or so) and I am out of ideas.

Actually, I tried again using Add Frame Hold Segment and by lengthening it at the start instead at tne end I was able to solve this for one transition. I have another one I cannot do as well, but there is a different reason.