Keyframe Navigation Problem with Mini Panel

Hello, I have the following problem with the Mini Panel when selecting keyframes in the Color Page of DaVinci Resolve 19. In the tracker panel I can jump from one keyframe to another by using the < > arrows in the user interface. This works fine.
Using the bottoms PREV KF and NEXT KF on my Mini Panel this only works in forward direction. I can not jump backwards. The bottoms themselves seem to be ok because there are working in other areas like the edit page. I am not sure if this is a bug or user error.
Addition: How can I delete keyframes here? Selecting one and clicking the trash bottom in the user interface also does not seem to work.
Using the bottoms PREV KF and NEXT KF on my Mini Panel this only works in forward direction. I can not jump backwards. The bottoms themselves seem to be ok because there are working in other areas like the edit page. I am not sure if this is a bug or user error.
Addition: How can I delete keyframes here? Selecting one and clicking the trash bottom in the user interface also does not seem to work.