"type" property in Chart.yaml disappears in the packaged chart

[tashoyan]

I have helm chat with the file Chart.yaml like this:

apiVersion: v2
name: my-app
description: My App
version: 1.0.0-SNAPSHOT
type: application
appVersion: 1.0.0-SNAPSHOT
annotations:
  build-time: 2023-01-12T12:39:07Z
  ... more annotations

After executing mvn package, I get a .tgz bundle with Chart.yaml like this:

annotations:
  build-time: 2023-01-12T12:39:07Z
  ... more annotations
apiVersion: v2
appVersion: 1.0.0-SNAPSHOT
description: My App
name: my-app
version: 1.0.0-SNAPSHOT

The property type disappeared.