[BUG] [Go] Generate client with default object miss

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

The generated code contains a syntax error due to a missing type in value initialization.

// NewForecastMetricsConfigInput instantiates a new ForecastMetricsConfigInput object
// This constructor will assign default values to properties that have it defined,
// and makes sure properties required by API are set, but the set of arguments
// will change when the set of required properties is changed
func NewForecastMetricsConfigInput(instanceId int32, name string, help string) *ForecastMetricsConfigInput {
	this := ForecastMetricsConfigInput{}
	this.InstanceId = instanceId
	this.Name = name
	var query string = ""
	this.Query = &query
	this.Help = help
	var builtin int32 = 1
	this.Builtin = &builtin
	var parameter MetricsParameterInput = {"rolling_training_window_size":7,"predict_days":7,"up_limit":0,"down_limit":0,"prophet_parameter":{"changepoint_prior_scale":0.05,"changepoint_range":0.8,"daily_seasonality":4,"growth":"linear","seasonality_mode":"multiplicative","seasonality_prior_scale":10.0,"weekly_seasonality":4}}
	this.Parameter = &parameter
	var inuse bool = true
	this.Inuse = &inuse
	var state MetricStateType = TO_TRAINING
	this.State = &state
	var version int32 = 0
	this.Version = &version
	return &this
}

openapi-generator version

7.2.0

OpenAPI declaration file content or url

openapi.json

Generation Details

openapi-generator-cli generate --additional-properties useOneOfDiscriminatorLookup  -p generateInterfaces=true  -i openapi.json -g go -o ./forecastclientgo --package-name forecastclientgo --git-host yunqutech.gitlab.com --git-repo-id forecastclientgo --git-user-id agilex

Steps to reproduce

Try to use and compile the code. It will fail.

Related issues/PRs

Suggest a fix

Start by running the provided openapi-generator-cli command with openapi.json and inspect the generated ForecastMetricsConfigInput constructor, especially the default object initialization. Trace that output into the Go generator entry point or template responsible for default values, then verify that the generated client compiles without the missing type syntax error.