[BUG] additionalProperties strange

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Please differentiate the bug

This repository is not responsible for the actual code generation. If you have problems with the code generation, please open the bug at OpenAPITools/openapi-generator.

Please also check if the bug is already known before you open a new bug.

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🐛 Bug Report:

Describe the bug

When you specify additionalProperties, if some option is false by default, and if you switch that option to false in config - openapi builds like that option was true.

Steps to Reproduce

Steps to reproduce the behavior:
So generated code equals when:

"additionalProperties": {
          "withInterfaces": false
}

and

"additionalProperties": {
          "withInterfaces": true
}

But if you remove property:

"additionalProperties": {}

It will be changed to default "false"

Expected behavior

switching options on config should be expected to affect the configuration

Screenshots

If applicable, add screenshots to help explain your problem.

Operation System (please complete the following information):

• OS: MacOS
• Version [e.g. 22]

Package System (please complete the following information):

• Version [e.g. 22]

Additional context

Add any other context about the problem here.

No source file or test is named. Reproduce the issue using the two additionalProperties configurations and compare the generated outputs, then trace configuration handling in the generator; done means explicitly setting withInterfaces to false produces output distinct from true while preserving the documented default when the property is absent.