When a FlexiPage is assigned via App/Record Type/Profile, related Custom Application is not pulled

[FabienTaillon]

Describe the bug
When a FlexiPage is assigned via App/Record Type/Profile, related Custom Application is not pulled. This is unfortunate as this is the CustomApplication metadata that stores the assignment.

To Reproduce
Steps to reproduce the behavior:

• Create a Scratch Org
• Create a Record Type (let's say on Account)
• Still on Account, create a record page FlexiPage
• Activate it using the App/Record Type/Profile option (you can use the standard Sales app)
• Pull everything
• The CustomApplication is not pulled

Additionally, you can go a step further to see that assignment won't work as it's not pulled:

• Create a Scratch Org
• Push everything
• Go to Account FlexiPage and look and the page assignments
• Notice assignment is not there

Would you have manually retrieved the CustomApplication, the assignment would be correct.

Expected behavior
CustomApplication should be pulled, so that assignment would be correct later on.

[FabienTaillon]

Case #43741835 created.

[FabienTaillon]

Related Known Issue: https://trailblazer.salesforce.com/issues_view?id=a1p4V0000029mKEQAY