I dont think that cubase score is able to write a 5/6 tuplet yet. Dorico can do it easily in the tuplet popover (which not yet is implemented in Cubase). So you can write it into the key editor but the score will not display it right.
I had the grid with the melody but couldn’t get with the drum editor. In C13, no problem for score to have in one measure 16ths, quintuplets and triplets. Latter 2 shown here, so really a step back in C5, screwing up scores, and I must be very careful to not open such in C15 and save as it will be ruined..
