Plugin functional tests failed after move from version IU-2019.3 to IU-2020.1

I'm developing plugin https://github.com/nyavro/i18nPlugin.

Gradle fragment before change:

...
test {
  intellij {
    version 'IU-2019.3'
    type "IC"
    pluginName 'i18n'
    plugins = [
      'yaml',
      'JavaScriptLanguage',
      'CSS',
      "org.jetbrains.plugins.vue:193.5233.118",
      "com.jetbrains.php:193.5233.102",
      "org.jetbrains.plugins.localization:193.5233.70"
    ]
  }
  ...
}
...

After change:

...
test {
  intellij {
    version 'IU-2020.1'
    type "IC"
    pluginName 'i18n'
    plugins = [
      'yaml',
      'JavaScriptLanguage',
      'CSS',
      "org.jetbrains.plugins.vue:201.6668.153",
      "com.jetbrains.php:201.6668.153",
      "org.jetbrains.plugins.localization:201.6668.60"
    ]
  }
  ...
}
...

I've got numerous of test failures. 
Looks like tests environment does not 'see' plugin.xml file, so my custom completion contributors, inspections, reference contributors do not gets loaded and applied to test cases. 
I also see implicit messages like:

java.lang.IllegalStateException: ServiceManager.getServic…ct, Settings::class.java) must not be null

running

ServiceManager.getService(project, Settings::class.java)

 this also approves my theory that there is something wrong with plugin.xml loading or injection framework.
How to fix it?