good evening together,
on testlive it`s only possible to create a foundation for trebuchet. If you try to continue to build more of the trebuchet parts, the whole disappears and only the foundation with your mats lay on top of it. 
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Same. First attempt I got a bag of mats, second and third attempt no bag was generated and no mats recovered. Dedicated g-portal server.
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Closing this topic. Please leave Testlive bug reports in the dedicated Testlive thread.