Duplicate Node bug

Hello everyone!
I have created some stroke animations and duplicated it with
duplicate2d node with some time offset .
but the duplicate node doesn't work properly.
it stops before the animation finishes specially when you use negative time offset.
I am using fusion 7.7 and I have tested it on Fusion 8 beta as well, the result is same.
Is there any workaround?

Yeah, purging cache on each frame seems to solve this issue as a workaround.
See here for a discussion and a link to a script which does that:

http://www.steakunderwater.com/wesuckless/viewtopic.php?f=16&t=574#p4924

It needs an official fix though.

Thanks!!!