AudioParameter versionHint in updated product - does this work?

We have an existing project build with JUCE 6 and no version hints in the parameters of course. Now we upgraded to JUCE 7 and got an assertion that we should set the versionHint to be non 0 for AU plugins. If we set this to 1 and release an update to our existing product, will this break automation in existing projects?
Also wondering why that assertion is only for AU and not for AUv3?

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