Map values generated as String instead of Input<String>

What happened?

I added a resource to schema.json with the following input property:

"additionalEnvironment": {
                "type": "object",
                "additionalProperties": {
                  "type": "string",
                  "plain": false
                },
                "plain": true
              }

In other words the key of the map should be a String and the value should be Input.
Instead the java code builder method for this property is generated as follows:

        public Builder additionalEnvironment(@Nullable Map<String,String> additionalEnvironment) {
            $.additionalEnvironment = additionalEnvironment;
            return this;
        }

Do note that the corresponding Python code is correctly generated as follows:

    @additional_environment.setter
    def additional_environment(self, value: Optional[Mapping[str, pulumi.Input[str]]]):
        pulumi.set(self, "additional_environment", value)

Expected Behavior

The java code should be generated as follows:

        public Builder additionalEnvironment(@Nullable Map<String,Input<String>> additionalEnvironment) {
            $.additionalEnvironment = additionalEnvironment;
            return this;
        }

Steps to reproduce

Clone the repo https://github.com/hansbarnard/pulumi-test-java.

From within the top level directory execute make build_java.

Check the file at sdk/java/src/main/java/com/xxxxx/ipidp/awsecsservice/service/EcsServiceArgs.java for the incorrectly generated code.

Output of pulumi about

Not applicable.

Additional context

Using java gen version v0.9.3.

Contributing

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To contribute a fix for this issue, leave a comment (and link to your pull request, if you've opened one already).

Start by running make build_java in the linked reproduction repository and inspect sdk/java/src/main/java/com/xxxxx/ipidp/awsecsservice/service/EcsServiceArgs.java. Trace the Java generator's handling of the additionalEnvironment object in schema.json, comparing it with the correctly generated Python type. Done means the Java builder uses Map<String, Input<String>> for this property.