[joachim]

Originally Posted by Boe Larsen

Yep, I know. That is needed then?

I think, it was always like this (always = my 5 year PT experience, so maybe it was different before).
Dragging only works in the track, where the mouse is, even with a selection made over multiple ungrouped tracks. But at least cutting or deleting breakpoints via "X" or "Del" across selected ungrouped tracks works.
The Ref Guide says : trimming automation breakpoint lines across multiple tracks can be done by grouping. So it looks like it is needed.