after update wrong timestamp in some feeds (date of node creation not original post date)

hello

we updated in our test environment to feedapi 6.x-1.9-beta2 and femp 6.x-2.0-alpha3 ...
now in some feeds the published date/timestamp is not the one of the original posting but of the one of node creation?
before the update everything worked fine ...

does someone has the same problem or knows a solution?

thanks momper