Hi,
thanks for reaching out. I have started investigating the issue and noticed that both TSR and TAA are refreshed (the TSR refresh can be more easily seen by setting r.TSR.Visualize 1 in the console). I will file a bug report for this issue.
In the meantime, a possible workaround might be to take high res screenshots and use r.HighResScreenshotDelay in the console set to a long enough value so that the TSR (or any other accumulation based effect like GI) has time to converge. A similar delay mechanism exists for taking automated screenshots. Would this approach work for your use case?
Thanks,
Sam