Bambu A1 PVA settings(PolyDissolve S1)

I am trying to print a mesh shape using PVA.
But it fails as shown in the image.
Any advice you can give me would be greatly appreciated.

Here is the information
Filament used
polyterra PLA
PolyDissolve S1 PVA

Environment
bambu A1 (pei plate)
I put PVA in a dry box and print while drying (at 50°C with a fan).