Invoking table.getRowModel() causes rows to collapse

[akivajgordon]

TanStack Table version

v8.21.2

Framework/Library version

React v18.2.0

Describe the bug and the steps to reproduce it

It appears that simply invoking table.getRowModel() has the side-effect of causing rows to collapse.

What I Did

In the attached minimal reproducible example, I am displaying the expanded state of the table, which starts out as true (i.e. expanded).

There is a button on screen labeled "Press me". Pressing that button should set the data to basically a copy of itself. This is what I found to be the least amount of work that I could do in order to get the behavior to appear, but is otherwise a no-op.

Expected Behavior

After pressing the button, I expect the rows to remain expanded, since I'm not explicitly toggling any expanded state anywhere in this example.

Actual Behavior

When I press the button labeled "Press me", you will see the expanded state unexpectedly changes to {}, indicating that all rows are now collapsed.

Oddly, this behavior only appears to happen when table.getRowModel() is invoked, which doesn't seem obvious. If you comment out that line, you'll see that pressing the button does not collapse the rows.

As a side note, I also noticed that commenting out the getGroupedRowModel property will also suppress this behavior; this seems unrelated, but I don't understand the intricacies here to know if that's expected behavior as well.

I'm intentionally not rendering a visual table in this example so as to minimize distraction; after all, TanStack table is meant to be headless.

If the behavior demonstrated in this example is intended, could you kindly help me understand why? It is not obvious to me why the rows collapse here.

I'm grateful for any help or direction that you could share.

Your Minimal, Reproducible Example - (Sandbox Highly Recommended)

https://codesandbox.io/p/sandbox/peaceful-lewin-cl58vv

Screenshots or Videos (Optional)

No response

Do you intend to try to help solve this bug with your own PR?

No, because I do not know how

Terms & Code of Conduct

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• I understand that if my bug cannot be reliable reproduced in a debuggable environment, it will probably not be fixed and this issue may even be closed.