Fix issue when overriding default chunk splitting rules

When overriding a default chunk splitting rule, the use 'break' would
mean that some of the other default chunk split rules might be ignored.
This isn't ever what you want.

I also clarified the current behaviour in a comment. I think in future
we should add a mechanism to extend the default rules, as well as the
current mechanism which allows only replacing them. But that is a
separate issue.

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