Ok, title was hard to think of…
Basically I don’t know if this is a bug or expected behaviour.
If you use box select to select multiple objects and do not have an active object pressing ‘m’ does not bring up the move to collection menu.
This only happens if you have no object selected before you box select, as box select adds to selection.
Also blender seems to remember the last active object, so if it is in the new box selection it becomes the active object again…
so basically to repeat this issue,
take 10 objects,
select 1 then deselect.
box select the other 9 objects
try pressing m.
nothing will happen.