React removechild not found?

Question

React

When trying to overwrite the state, it falls off with an error

Failed to execute 'removeChild' on 'Node': The node to be removed is not a child of this node.

As far as I understand, when rerendering a table, it tries to remove the missing element.
I am attaching a link to the sandbox.
Select some squares and press merge
https://codesandbox.io/s/serverless-leftpad-70nbl?...

Answer 1

Don't mix React rendering with manual resaussing of elements. Otherwise, it turns out dual power, smoothly turning into anarchy (the mother of order).