Sub-buttons not showing entity picture

[oerix]

Describe the bug
When using a person entity for sub-buttons the user icon is shown, and not the entity picture. It works fine for the main popup header, just not for sub-buttons. I'm not sure if this is a bug or just not supported.

To Reproduce
Steps to reproduce the behavior:

1. Create Popup Bubble card
2. Select any Button type
3. Add Person entity to sub-button field
4. Toggle show icon

Expected behavior
Show person entity picture instead of user icon. Maybe add show_entity_picture: true option?

Screenshots

Informations (please complete the following information):

• OS: macOS
• Browser/App: Safari, Chrome
• Bubble Card version: 2.1.0beta-3
• Home Assistant version: 2024.7.2

Thank you! 🍻