Why is the plugin version set to IDE build version?

I'm currently working on a Pycharm plugin development using:

- gradle-intellij-plugin v2.1.0

- gradle 8.2

Problem: Plugin version display as “232….” after installation

Root build.gradle:

plugins {
   id('org.jetbrains.intellij.platform') version '2.1.0'
   id("java")
}

group = pluginGroup
version = pluginVersion

repositories {
  //...
}
dependencies {
    intellijPlatform {
      pycharmCommunity '2022.3'
      pluginModule(implementation(project(':submodule')))
      instrumentationTools()
    }
}

tasks {
    sourceCompatibility = javaVersion
    targetCompatibility = javaVersion
    compileJava.options.encoding = 'UTF-8'
    patchPluginXml {
        sinceBuild = "223.7571.182"
    }
}

File gradle.properties:

javaVersion = 17
pluginVersion = 1.4.0-beta1
pluginGroup = com.my.group

In the build.gradle of the submodule, there's “version = pluginVersion ” too.

Now after I run gradle-task buildPlugin, and install the zip file with Pycharm Professional(2023.2.5)，the version displays as “232.10227.11” (which is the build version of the IDE). I expect it to be “1.4.0-beta1”

Please tell me what I'm missing here.