sandbox Issue - WebPageProxy::Ignoring request to load this main resource because it is outside the sandbox

# Bug Report
sandbox Issue - WebPageProxy::Ignoring request to load this main resource because it is outside the sandbox
## Problem
I am using cordova.file.applicationStorageDirectory
that access sandbox
and still this error appear to me request to load this main resource because it is outside the sandbox
### What is expected to happen?
that i can read and write files in sandbox for ios

### What does actually happen?
sandbox Issue - WebPageProxy::Ignoring request to load this main resource because it is outside the sandbox

### Environment, Platform, Device

cordova 9
ios platform 5.1.1

The report names cordova.file.applicationStorageDirectory, Cordova 9, and iOS platform 5.1.1, but no source file, test, or entry point. Start by reproducing the sandbox error on iOS and tracing the file plugin's handling of applicationStorageDirectory; done means files can be read and written there without the WebPageProxy sandbox warning.

Written by the indexing model from the issue text.