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.

Addition: How can I delete keyframes here? Selecting one and clicking the trash bottom in the user interface also does not seem to work.

3dot menu > Delete Keyframe
The trash icon is for deleting Tracking Points in Interactive Mode.

Yes, i do also have mini panel too. it really make things harder in some works.

When you long-press "Next Frame" button, it goes last frame of the cut.. Good.
When you long-press "Next Clip" button, it doesn't work to go last clip
When you long-press "Next Node" button, it doesn't work to go last color node.

There is too much lack-of-options we can make, i already shoot a video to improve that working experience recommendations but they don't care for 1 years.

Thank you for your replies. Keyframe navigation via Mini Panel sometimes works sometimes not.
I just opened this project and for the moment the navigation works.
Checking the long press options I came to the same result as described above.
Thanks Christoph for the tip how to delete the keyframes. This way it works. Thank you.