Retrieve over association doesnt work

I am running into a problem in my acceptance environment. I do a retrieve over association on an object, of which I can see the object in the associated object attribute in the debugger, however the retrieve returns empty. For some reason, I have not been able to reproduce this bug in my local environment, while it is running the exact same version. The object also does not get deleted or rollbacked anywhere in the flow. edit: the pictures don't seem to work so here are the urls:
1 answers

Did you try to change to a database retrieve instead and see what happens? And can you share your microflow? Because just from the above pictures I am not able to tell if you made a mistake somewhere.