Setting a default topic causes Virtual Agent in Service Portal to append blank lines at the end of a chat when clicking 'Click here to start a new conversation'DescriptionWhen a default topic is specified using the sysparm_topic URL parameter or when using the undocumented vaSystem.switchTopic() the conversation UI is put into a bad state and can face these issues. Unable to end the conversation manually because the X bubble is grayed out. When trying to start a new conversation after the first one finished you just get blank lines instead of the topic picker. Steps to Reproduce 1. Configure VA to use a default topic by setting sysparm_topic=<topic sys_id> in the URL.2. Go to the /sp page.3. Start a new conversation on VA.4. Reach the end of the conversation.5. Click on 'Click here to start a new conversation'. Instead of VA restarting the conversation, this freezes and keeps appending lines to the window.Workaround Remove the sysparm_topic and sys_id from the URL that is starting the virtual agent. Instead of setting the default topic this way, follow KB0781492 - How to set a default topic or IBM Watson topic for Virtual Agent in "Agent Chat" in service portal? Related Problem: PRB1367284