Fix multi memtile buffer viz

[mariodruiz]

Describe the problem solved by the commit

Fix viz for multiple MTPassThrough and MTSplit

How is the problem solved?

Adding more test to cover as much test cases and possible and fixing the logic

Are there any risks associated to the change?

No

Is there a documentation impact?

No

Checklist

• [x] I added a test to cover my changes
• [x] Existing and new test pass
• [x] I read and I accept the CONTRIBUTING.md guidelines