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Use snapshots from #113871 - Compared first to second and second to first I got the same value (+3 712 B) for org.openide.awt.Actions$MenuItem for both comparisons.
See issue #113871 for more details.
This problem is caused by duplicate entries for org.openide.awt.Actions$MenuItem in snapshots. It looks like org.openide.awt.Actions$MenuItem was loaded by two different classloaders. This is caused by NetBeans complicated classloader structure. It seems to be rare issue.
Fixed in trunk.