Greetings from Syncfusion.
In our SfChip control we don’t have implement the ChildRemoved event. You can achieve this by creating ChildRemoved event for the layout which you have used inside the SfChipGroup. We have created a ChildRemoved event for the FlexLayout which used inside the SfChipGroup and it fire when closing the chip, its work as expected.
Please check the sample from the following
Please let us know if you have any other concern.