I see. But I find your terminology rather confusing.
When you refer to a style, you do not actually mean something you can select under the "style" menu and chose from a drop down list of "styles"?
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The "turn groove into a style" behaviour appears to be different to 2.2 but I'm still not sure whether it is working fully or not.
If I add a groove importer to a given style, load a midi clip ...