TitleView causes memory leaks

[GUELIANEBelkacem]

Description

Adding a TitleView to any page, no matter how simple, causes a catastrophic memory leak.

In the repo i included, you'll find the basic MAUI new project with 3 test pages, one is for a simple page with a TitleView. I included in the repo a GC dump resulting from 1 navigation to/ back from the TitleView Test Page.

In order to limit the scope of this discussion i won't go into the many many many other leaks we have, i'll try to create separate bug reports and app samples whenever possible. But my god how is it possible that one small leak caused by TitleView results in the entire page, context and all child elements living forever in memory??!!!

Leaks happen, and that's fine as long as some effort goes into compartimentalisation and fault tolerance, it cannot be that 1 small leak in 1 small component could root the entire page and its object tree in memory, this just should not be! This is the real discussion. I would refer anyone insterested into #21918 (comment).

Steps to Reproduce

1. Clone the test repo and run the project
2. In the main page, click on Goto TitleView Test
3. Navigate back from the test page
4. A GC dump will confirm that the TitleViewTestPage is still in memory and is never cleared
5. Compare the same operation with the EmptyTestPage (which is just the new navigation page "Welcome to .Net MAUI" template) where the page is cleared correctly

Link to public reproduction project repository

https://github.com/GUELIANEBelkacem/MySuperLeakyApp.git

Version with bug

8.0.10 SR3

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

iOS, Android

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

No response

[Zhanglirong-Winnie]

Verified this issue with Visual Studio 17.10.0 Preview 4(8.0.10). Can repro on iOS and Android platforms with sample project.
https://github.com/GUELIANEBelkacem/MySuperLeakyApp.git