Add row on TreeGrid unconfigures hierarchy

When trying to add nested rows to a TreeGrid, after some levels, the hierarchy unconfigures.
Someone knows why this is happening or if there are another way to nest multiple rows (like in Tree)?
Im using the 7.1.2 version.
You can check on this snippet:

Thank you for your report.
The problem is confirmed. We’ll try to fix it in one of tyhe future udpates.
For now as a workaround, please, try to use the follloowing custom solution for the data adding:

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We have fixed your reproted problem in the latest (7.1.6) dhtmlxSuite udpate.
Now, the nested data adding should work properly.
You can test it in your original snippet.