With reduced tree package view (may matter),
in new ant web project(in my case with tomcat 7 as target)
create a package a.b.c
add a few classes 'NewClass', 'NewClass1',.. (I have 4 classes)
close all editors
in project tree, select 'refactor-rename' on 'a.b.c'
and change 'c' to 'some'/finish refactoring

all classes and the package are marked with error badges,
tooltip show 'parse error'
/
have soem related lines in log:
INFO [org.netbeans.modules.refactoring.spi.impl.ParametersPanel]: org.netbeans.modules.refactoring.api.RefactoringSession@12e964d called start multiple times
//
and after opening a class:
WARNING [org.netbeans.modules.java.source.tasklist.IncorrectErrorBadges]: Incorrect error badges detected, file=C:\Users\xx\AppData\Local\Temp\WebApplication20\src\java\a\b\some\NewClass.java.
WARNING [org.netbeans.modules.java.source.tasklist.IncorrectErrorBadges]: Going to recompute root=C:\Users\xx\AppData\Local\Temp\WebApplication20\src\java, files in error=[file:/C:/Users/xx/AppData/Local/Temp/WebApplication20/src/java/a/b/some/NewClass.java, file:/C:/Users/xx/AppData/Local/Temp/WebApplication20/src/java/a/b/some/NewClass1.java, file:/C:/Users/xx/AppData/Local/Temp/WebApplication20/src/java/a/b/some/NewClass2.java, file:/C:/Users/xx/AppData/Local/Temp/WebApplication20/src/java/a/b/some/NewClass3.java].