When Sims are chatting and one Sim is walking to sit down during the conversation, if the other Sim triggers an interaction (such as asking a question), the Sim being routed will abruptly teleport to the seat to respond. After finishing the interaction, they then teleport back to their previous position and continue walking again to sit down.
This creates a looping effect where Sims repeatedly teleport between positions instead of smoothly completing their movement and conversation. It breaks immersion and makes interactions look unnatural and glitchy.