How to remove "greyed-out part" after splitting a layer?
I can split a shape layer with Command+Shift+d. However, when I try to split a video layer, "greyed-out part" appears:


Is it possible to split a video layer without the "greyed-out part"? If not possible, is it possible to remove the "greyed-out part" after the split?
This is very annoying for example because "Enable Time Remapping" creates keyframes at the very start and the very end of the current layer while respecting the "greyed-out part":

