Updating data doesnt expand the data tree

[NektariaMoka]

What are you trying to do?

Im trying to build a table with nested tree folder inside.
Table has multiple columns and tree contain nested folders.

What troubleshooting steps have you tried?

During the adding new data to the datasource data teh model is updated but not reflected ont he tree view and expand is not working anymore.

Reproduction

[Steps to reproduce:]
https://stackblitz.com/edit/angular-table-tree-example-k2zqmt?file=app%2Ftable-basic-example.ts&file=app%2Ftable-basic-example.html,app%2Ftable-basic-example.ts

Environment

• Angular:
• Material Table
• Material tree system

[Cubelaster]

I'm having the same issue.
Seems like entire tree is full of bugs.
Generally the state of the component is not handled correctly.

[NektariaMoka]

Check out here.
Have already managed to give some solution:

https://stackblitz.com/edit/angular-table-tree-example-ybjqmy?file=app%2Ftable-basic-example.ts&file=app%2Ftable-basic-example.html

[Cubelaster]

Check this one, it seems to pinpoint the problem correctly.
Root issue

[amysorto]

Duplicate of #11381

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