I believe the change occurred when the shift click on selection was changed to add to selection instead of drag on the axis.

Old behavior (1.1.3, though that's just the one I tried. More recent versions than that do this)

New behavior(1.1.5.7)

1. Create a selection with the rectangle select tool
2. Click and drag that selection to move it.
3. Change to magic wand tool
4. Right click a color to deselect it.

In old versions of Aseprite, the selection was subtracted from. In the current version, right clicking usually drags the selection. If you remove step 2 right clicking with subtract from the selection in old and new versions.

Regardless, since dragging could be accomplished with left click, I'd like to see that old behavior return.