Thank you for the code example.
Please have in mind that the collapsed/expanded state of a group is part of the data. The `KendoGrid` is not doing it automatically.
In the example, you are saving which group is collapsed and afterward adding it to the data. The thing is that the groups are not real data and they do not have ID - unique value. This is why when we apply that group with value X is expanded, we will set it to all groups with that value.
I agree that we can provide a method that will take this into account as well and apply the correct expanded state. We will add this as an official enhancement and it can be monitored here:
You can check the status to see when we have implemented the new logic.
Please let me know if you need more assistance.
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