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While trying to reproduce and study issue #55423, I found that when creating a new freeform project and specifying output JARs, no <export> element was created in project.xml! This seems to be a regression, but I don't know from when.
Never mind; turns out <export> will only be generated in case 'build' is mapped, which is reasonable.
Marking this issue as VERIFIED since the issue reporter == issue owner.