Your secondary weapon will assign itself to left click after travelling

I have a witch.

Main hand: scepter. Other hand: staff.

- Unassign any skills assigned to your left-click slot.
- Travel somewhere—via waypoint or portal.
- Check your left-click slot. Your secondary skill has been assigned.

Now, in the middle of a fight, I left-click, my weapon swaps, my spirit disappears, and my minions are gone. By the time you realize mobs are not dying, and you see only your cleric fighting for his life, it's too late.

Shouldn't the player's preferences stay persistent? Travel or not, reloading or not? Is this by design?

Thank you!

Oh, here's a video to make things clear:
https://youtu.be/8Nqxd32Vl5s

Edit: I just noticed this issue happening at random times as well. I can't pinpoint exactly when, but I keep finding that my secondary weapon skill has been assigned to my left-click slot. To avoid accidental swaps, I even reassigned the weapon swap key to the farthest possible key—but the issue persists. I'm fairly certain this isn't something I'm doing.

I think I've found my own solution.
Instead of leaving the slot empty, I assigned the "Move Only" action.



Now it does not change.