Prevent block to be disconnected from page types

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If you edit a block that was assigned from a page type will it create a new instance and disconnect the block from the default template.

Is it possible to stop this behavior?

I tried overriding the save() method of the block's controller (so it won't execute parent::save() ), but this didn't do the trick.

The underlying reason: I don't want to update values from the btTable, so the block itself should remain the same.

Ideas?

A3020