If running on an x86_64 or 32-bit ARM SoC device the Docker binaries are going to update once the new addon repo is accessible and this might throw up some minor config issues related to dockerfiles; sometimes Docker conventions change and there's probably a large enough jump from whatever (older) version is used with LE 9.2.6 for that to occur.
If running on a 64-bit ARM SoC device, LE12 changed images from "arm" (32-bit) userspace to "aarch64" (64-bit) and this forces you to remove all "arm" containers before updating and redeploy them using "arm64" versions once the update has completed. If you leave arm containers installed they will crash post-update due to wrong CPU arch.