Here is an issue while using chunk (ChunkDownloader plugin)

There is an issue while using chunk (ChunkDownloader plugin).
When I export template project using chunk output pak file is correct, but when I export (OWS) my project in output I see “pakchunk0optional-Windows.pak and pakchunk0-Windows.pak” files
while I need only the “pakchunk0-Windows.pak” file.

Could you please help me with this issue.