Issues with Spiral Mode: Unwanted internal lines and visible seam in Bambu Studio

Hi everyone, I’m running into some issues while trying to slice this model in Spiral Vase mode.

1. Unwanted internal lines: As you can see in the screenshot, there are straight lines crossing the top opening. It looks like the slicer is trying to bridge or fill a top surface that shouldn't be there.
2. Visible seam: Even though I have "Spiral Vase" mode enabled, there is a very noticeable vertical line/seam running down the side. I thought spiral mode was supposed to be a continuous path without a Z-seam.

Details:

• Printer: Bambu Lab P2S
• Slicer: Bambu Studio
• Settings: Spiral Vase mode is ON.

Does anyone know why the slicer is generating these paths and how I can get a clean, continuous spiral print without these artifacts? Any advice would be greatly appreciated!