Master-details fails working after exportCollectionActionListener init

hi,
in application developed in jdev 11.1.2.3, in bounded task flow i have a standard master table-detail table page generated by default wizard.
on master table i defined an export-to-excel button:
<af:commandButton text="To Excel" id="cb1">
<af:exportCollectionActionListener type="excelHTML" exportedId="t1" filename="file1.xls"/>
</af:commandButton>
in pagedef the underlying table's ChangeEventPolicy is ppr.
<tree IterBinding="Tab2View1Iterator" id="Tab1View1" ChangeEventPolicy="ppr">
when i start application ,master-detail works fine.
if i press button to call export to excel, the ppr stops working.
i.e. when i change record in master table, no refresh happens in detail table
what can it be? isn't it an jdev bug nobody noticed before?
can it be fixed somehow?

Timo,
when you say ppr component, could you provide an example, a piece of code?
what i proved as a working cure is execute query on master...
as i found out further, the problem is somehow related to region.
after export to excel button is pressed, i try to refresh current page fragment by navigating to another fragment and back.
then i receive an error: component region1:1:t1 is not registred for active data...server exception during PPR, #1
(region1 is my region, t1 is defined in page fragment)

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