I cloned the last MASTER, built an image for Station M3, checked, DTB is available, everything works. It is strange why there is no DTB in the RC image, perhaps it is assembled from "old" packages from the repository (there is no package with DTB)? At the same time, I checked the build of a variant with integrated DTB in the kernel package. Everything works. I can send a PR with patch fixes for a new version of the core package for M3 with one package for the core and DTB (just as it is implemented for the "media" core).