Copying pages with blocks

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Copying pages with blocks is possible,
Altough when I do that seems an easy way to reuse layout and not to have to place blocks anew.
But big but I copy the page, rename it, and then alter the jpeg file in a Imageblock
And then the Image in the original block also changes so why would it then be possible to copy whole pages I dont needt it twice.
So I'm doing it wrong again or do I have a bug?

Kind egards,

Niels

NLS61