From PL8 to PL9….One-time engine migration?

DxO PhotoLab
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On DPreview there’s a thread right now in which a poster says:

“………So as excited as I was about the new masking options, PhotoLab 9.0 Elite does not properly interpret my masking from PhotoLab 8.7 Elite….”
He also posted images as an example.

In a reaction, another poster said :
"……I just wonder, from DxO website: “• A one-time engine migration is required to edit local corrections created in earlier DxO PhotoLab versions……”

https://www.dpreview.com/forums/post/68423994

My comment / question there:
“While I do not have PL9 yet, I’m already (and still) interested in how to perform this “migration” , automatically or manually. From memory I never needed to pay attention to anything like “migration” in earlier upgrades. New version…installing…ready (and all corrections local or not, where copied as they where before).
So, what’s all this and what to do exactly when installing PL9??
Still very unclear to me…”

Can someone please explain what’s meant and what to do?
Thank you.

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That could have been explained better!

Once you’ve edited/saved an image with PL9, you can no longer revert to an earlier version—presumably due to incompatibilities.

If it’s important to you, work on a copy (new folder, etc.).

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Thank you Wolfgang. I can understand that, but I read it, that upgrading from PL8 to PL9 local edits done in PL8 are gone or at least shown wrong in PL9.
In the past I always installed the newer version and images showed with proper (local) corrections already made in earlier version. After that no need to go back.

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And that’s still the case - no change.

The reference to the “one-time engine migration” is a process that’s required for some LA types (not all) that converts them to the new PLv9-specific format … after which, your corrections cannot not be read/processed by an earlier version of PL (as has always been the case - as explained by @Wolfgang

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For example, I noticed that the lens correction has completely changed: the scale of values for the intensity of the correction is different now. It has somehow been rescaled, so of course when opening with PL9 a previously edited image, that value is changed (for example, from 1.0 to 133).