ggplot::scale_x_date() warning when plotting a CausalImpact result object

When plotting the result object from CausalImpact, there is a ggplot warning. I have not seen this happening before.

<img width="547" height="178" alt="Image" src="https://github.com/user-attachments/assets/8f4d77c4-0f81-4f9d-a3b2-42c4ecc0a018" />