Hi Maffers80, thanks for the detailed report, and sorry about that.
You were right: it wasn’t your AMD GPU. Version 2.7.0 had a bug and you found it. That's fixed in v2.7.1. Please update from the itch.io page and try again with that same file, it should work normally now.
Sorry for the hassle, and thanks again for buying it and taking the time to write this up. If anything still looks off after updating, let me know.