Lerping panning UV's causes annoying jerk

I’m working on a water material whereby I want to lerp a panning UV with a panning noise texture to create a fluid look.

It looks as expected, however I’m seeing a very annoying jerk each time the main texture completes each pan. I’ve created a example package so you can see what I mean:…ew?usp=sharing

Does anyone know why this material has this jerk?

Edit: I fixed this by applying the second pan after lerping the base uv with the noise.