Hi Dominik,
Thank you for your post.
1. We have a corresponding feature request to update property Expansion expressions in Assertions in our backlog, so this feature can be implemented in one of the future product releases.
2. The Trial version has all the benefits of Pro version for the evaluating period, so the behavior is the same. I couldn't reproduce this issue in Ready! API 1.9.0. If you can reproduce the issue, it's better to open a new support case here: https://support.smartbear.com/message/?prod=ReadyAPI and provide us with a video which demonstrates the issue (maybe I'm missing something) and the error log.
