Almost identical behavior for me on EmuNand with Atmosphère 1.4.0 (pre-release), FW 15.0.0, using payload=bootloader/payloads/fusee.bin with hekate_ipl.ini, or chaining Hekate and choosing fusee.bin from payload, or loading fusee.bin with TegraRCMGui. Everything works fine on FW 14.1.2.