The fix for this jira only works for properties that use "property" access and only when using the "old" byte code instrumentation. IOW, it will not work for the new enhancer in master branch. Another Jira will be added to fix this issue using the new enhancer.

For field access, updates do not get persisted. I will cover that fix HHH-9984..

I suspect that there will still be a problem merging an entity with an initialized lazy embeddable, or a non-lazy embeddable that contains an initialized sub-property. If someone finds that to be the case, please create a new jira.