Thank you dorisyan for your reply.
Please give me a little bit to prepare a working ( e.g. crashing ) demo for you. Stripping down everything with respect to code and assets will take some time.
Is there a private channel or email where I can post instructions and download links as we don't want to freely distribute our source code around?
I have now prepared a demo with source code that shows you the issue we encounter. The GPU we tried for this is a AMD RX 580.
The demo is a 64 Bit executable. The source code project is done with Visual Studio 2017 latest version.
Please let me know where I can send instruction on how to get the demo with some small explanations on what to do. I don't want to post the link to the demo online.