My guess would be the response text is passed through a rudimentary templating engine that looks for { and }. Somehow it must be processing the whole chat history. The templater fails at the unexpected braces in the code block and then just gives up (probably a try-catch ignores the error and sends the message anyway).
Looks like anyone who has access can invite their steam friends, so I guess it’s like closed beta? Seems weird to have something soft-launch with zero announcements. The design also looks very rudimentary. Im