Problem resizing a trill's wavy line

Hey!

Windows 10, MuseScore 4.1.1

In the attached score I have added trills in m.32-34, m.45-46 and m.49-50. All three of them are followed by a couple of grace notes which are notated at the end of the measure. I want the wavy lines of the trills to extend up to the first grace note but note over the grace notes. So for the last two trills, I clicked on them and dragged the right handle a bit to the left and everything was fine. Dragging the handle of the first trill, however, causes it to move to the system above. Pretty weird. I just noticed that if I delete the spacer in m.36, I am able to drag it normally. Any explanation?

On a side note and speaking of spacers: I have been wondering about staff and system spacing for some time now. I'm still struggling to fully understand what all the spacing settings under "Enable vertical justification" and "Disable vertical justification" mean. I've been asking myself: how about having a dedicated "Min. vertical distance" setting (Format -> Style -> Page) for the min. distance between two systems that is measured from the bottommost point of the first system to the uppermost point of the second system (i.e. taking into account all the elements that go outside the staves). I mean I almost don't care about the distance between the 5 lines of adjacent staves; rather it is the min. distance between their vertically closest elements that I care the most. The reason is that to my eyes this is what creates a feeling of clutter and desire to add spacers. In the same attached score, I had to add a spacer in m.26 to eliminate the clutter between that system and the one below it. Am I missing a setting or way of avoiding these spacers?

Thanks,
Krasi