In Keyboard Shortcuts, Shift-Ctrl-Left/Right is said to move markers and locations to the previous / next region boundary, but that doesn’t seem to consistently be the case in my session (Ardour 8.12 official on Linux Mint Debian Edition).
The active marker is moved, but I am unable to predict how far it will move, and certainly it does not move from one region boundary to the next. However, creating a new marker and moving it around, I get expected results. So to me it seems that markers might start behaving funnily after having been moved around a couple of times.
Anyone else experiencing this?