Issue with GormEntity in Micronaut 3.0.3

I have a simple micronaut 3.0.3 application built with hibernate-gorm.

I get the following error when attempting to send a GET request like this http://localhost:8080/?commentId=1

Failed to convert argument [command] for value [null] due to: Specified value [1] is not of the correct type: class java.lang.Long (through reference chain: com.example.PostCommand[\"commentId\"])

This code worked in Micronaut version 2.5.12. I searched the migration guide about this but could not find any mentions about anything changing in this department.

PostCommand:

package com.example

import grails.gorm.annotation.Entity
import org.grails.datastore.gorm.GormEntity

@Entity
class PostCommand implements GormEntity<PostCommand> {

    String title
    String content
    Long commentId

    void setCommentId(Long commentId) {
        this.commentId = commentId
    }

    void setCommentId(String commentId) {
        this.commentId = Long.valueOf(commentId)
    }
}

PostContoller:

package com.example

import io.micronaut.http.HttpRequest
import io.micronaut.http.HttpResponse
import io.micronaut.http.annotation.Controller
import io.micronaut.http.annotation.Get

@Controller('/')
class PostController {

    @Get('{?command*}')
    HttpResponse search(HttpRequest request, PostCommand command){
        HttpResponse.ok()
    }
}

When removing all setters or just the setter for the string type, it works.

Here is a github link for anyone interested.

Any suggestions would be helpful.