Hi Frederick, yes that's currently how it is supposed to work, it's the history update function working there.

You can turn it off by selecting the result of the mirror and using Edit > History > "Disable update".

In the future this will probably change a little so it's not on by default, it can be surprising.

- Michael

Hi Michael,

Thanks.

I just recently noticed that behavior - I don't know how I missed it for so long.

Frederick