Failed to generate v1 signature

## Problem
There was a problem migrating from cordova-android 8.1 to cordova-android 11

The application is not signed by the Existing key. Signs with a new key, but the application has been published on GooglePlay for a long time, the option with a new key is not acceptable.

Removed all plugins. The problem persists.

```
* What went wrong:
Execution failed for task ':app:signReleaseBundle'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.FinalizeBundleTask$BundleToolRunnable
> Failed to generate v1 signature
```

All similar problems have been studied, it is advised to contact support. But I don't think it can be solved. There must be a solution

The problem is 99% similar to mine -> https://stackoverflow.com/questions/69911745/how-can-i-use-the-current-keystore-to-build-successfully-or-migrate-to-new-k

Start by reproducing the cordova-android 8.1-to-11 migration and inspect the :app:signReleaseBundle failure, focusing on the existing keystore and release-signing configuration. Done means a release bundle is generated and signed with the existing key rather than a new key.

Written by the indexing model from the issue text.