Does BG3 automatically stop all character movement when you perceive a trap? If not, it should.
It absolutely does not.
+1 to OP.
The stopping would be awesome. I really like how Pathfinder pauses the game and really highlights the trap.
Auto-stopping would be great. It would also be neat if the movement system didn't make your party members trigger traps you've already noticed because they're walking around like headless chickens.