Android "AppBundle" setting stays active when the build system is changed from "Gradle" to "Internal"

Steps to Repro:
1. Create a new project
2. File > build settings
3. Switch platform to android
4. Enable > AppBundle
5. Switch build system to Internal
6. Build

Actual Result:
1. Build generated as aab format
2. Even though app bundle setting is disabled for internal build system it's functionality still stays active

Expected Result:
1. On switching build system to internal App bundle setting should be automatically disabled as it's only visible for Gradle build

Environment:
Windows and Mac

Occurring with:
2018.3.0a4

Note: App bundle option is added in 2018.3.0a4