afl_post_library is only called once on setup

[Jello]

I'm attempting to use afl_post_library to modify test cases. I only see my code called once on setup with the "hello" test string, as seen here. https://github.com/googleprojectzero/winafl/blob/master/afl-fuzz.c#L1477

After this, it doesn't seem my dll code is called again, the test cases aren't generated with my post processing, and none of the debugging strings I've put in my DLL get executed anymore.