[ui:repeat] field value disappears if validation error exists on current site

A testcase to reproduce the issue is attached.
1. http://localhost:8080/jsf2test/index.jsf
2. enter some data into field 'input2' and field 'item' (field item is surrounded by ui:repeat) and leave the first field 'input' empty
3. click button

result: validation error and field value of field 'input2' is shown (this is expected). But field value of field 'item' is not shown anymore (this is not expected)

Note: with mojarra-2.1.5 the field value doesn't disappear