[BUG] [Java] additionalModelTypeAnnotations does not resolve variables

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

I am trying to add an annotation to my generated models that includes the version of the schema. This variable is available in a template as {{version}}. If I use a custom additionalModelTypeAnnotations.mustache containing the content: @com.example.SchemaVersion("{{version}}") then it is replaced with @com.example.SchemaVersion("1.2.3") as expected.

For simplicity's sake, I would like to do this without introducing a custom template file. I can add an annotation line using

--additonal-properties 'additionalModelTypeAnnotations=@com.example.SchemaVersion("{{version}}")'

Despite the template and the property above containing the exact same text, the annotation added through the property is rendered as @com.example.SchemaVersion("{{version}}") instead of resolving the {{version}} variable.

openapi-generator version

7.8.0 and 7.12.0

OpenAPI declaration file content or url

{
    "openapi": "3.0.3",
    "info": {
        "title": "MyApi",
        "version": "1.2.3"
    },
    "paths": {},
    "components": {
        "schemas": {
            "MyModel": {
                "title": "MyModel",
                "type": "object",
                "properties": {
                    "MyProperty": {
                        "title": "Property",
                        "type": "string"
                    }
                }
            }
        }
    }
}

Generation Details

java -jar openapi-generator-cli-7.8.0.jar \
    generate -g java \
    -i openapi.json -o out \
    --global-property apis=false,invokers=false,models='' \
    --additional-properties 'additionalModelTypeAnnotations=@com.example.SchemaVersion("{{version}}")'

Steps to reproduce

Run command above. The file generated at out/src/main/java/org/openapitools/client/model/MyModel.java contains the annotation line in question on line 51 (for generator version 7.8.0)

Related issues/PRs

Suggest a fix

Start by running the documented Java generator command with the supplied openapi.json and compare the output in out/src/main/java/org/openapitools/client/model/MyModel.java with output from the custom additionalModelTypeAnnotations.mustache template. Trace how additionalModelTypeAnnotations is rendered versus the template variable {{version}}. Done means the property-based annotation contains 1.2.3, matching the custom-template output.