graphic is not displayed in some cases.
To reproduce, use the test app attached.
Initially, the sample dialog has:
- a graphic
- a content
- an expandableContent
- 2 buttons

1- First test case
- Show dialog: the graphic is present
- close the dialog
- click on Change content: Reset
- Change header: With Button
- Show dialog: Bug- the graphic is missing

2- Second test case
(Restart the test app)
- click on Show dialog: the graphic is present
- close the dialog
- click on Change header: With Button
- Show dialog: Bug- the graphic is missing
- click on Change header: Reset
- Show dialog: Bug- the graphic is missing