LOG 1 (with loading save state error)
[INFO] [State]: Loading state "/retroarch/cores/savestates/FCEUmm/Back to the Future (U) [!].state.auto", 0 bytes.
[ERROR] [State]: Failed to load state from "/retroarch/cores/savestates/FCEUmm/Back to the Future (U) [!].state.auto".
[INFO] [State]: Saving state "/retroarch/cores/savestates/FCEUmm/Back to the Future (U) [!].state.auto", 13768 bytes.
[INFO] [State]: Loading state "/retroarch/cores/savestates/FCEUmm/Back to the Future (U) [!].state.auto", 13768 bytes.
[INFO] [State]: Saving state "RAM", 13768 bytes.
[INFO] [State]: Saving state "/retroarch/cores/savestates/FCEUmm/Back to the Future (U) [!].state.auto", 13768 bytes.
[INFO] [State]: File already exists. Saving to backup buffer ...
[INFO] [State]: Loading state "/retroarch/cores/savestates/FCEUmm/Back to the Future (U) [!].state.auto", 13768 bytes.
[INFO] [State]: Saving state "/retroarch/cores/savestates/FCEUmm/Back to the Future (U) [!].state.auto", 13768 bytes.
[INFO] [State]: File already exists. Saving to backup buffer ...
[INFO] [State]: Loading state "/retroarch/cores/savestates/FCEUmm/Back to the Future (U) [!].state.auto", 13768 bytes.
[INFO] [State]: Loading state "/retroarch/cores/savestates/FCEUmm/Back to the Future (U) [!].state.auto", 13768 bytes.
[INFO] [State]: Saving state "RAM", 13768 bytes.
[INFO] [Playlist]: Written to playlist file: "/retroarch/content_history.lpl".
[INFO] [Config]: Saving salamander config to: "/retroarch/retroarch-salamander.cfg".
[INFO] [Config]: Saving salamander config to: "/retroarch/retroarch-salamander.cfg".
[INFO] [Config]: Saved new config to "/retroarch/retroarch.cfg".
[INFO] [Core]: Content ran for a total of: 00 hours, 12 minutes, 59 seconds.
[INFO] [Runtime]: Saving runtime log file: "/retroarch/playlists/logs/FCEUmm/Back to the Future (U) [!].lrtl".
[INFO] [Core]: Unloading game..
[INFO] [Core]: Unloading core..
[INFO] [Core]: Unloading core symbols..
[INFO] [Core]: Saved core options file to "/retroarch/config/FCEUmm/FCEUmm.opt".
[INFO] Threaded video stats: Frames pushed: 81302, Frames dropped: 77.

LOG 2
[INFO] RetroArch 1.17.0 (Git 92608cb)
[INFO] === Build =======================================
[INFO] Capabilities:
[INFO] Version: 1.17.0
[INFO] Git: 92608cb
[INFO] Built: Feb  2 2024
[INFO] =================================================
[INFO] [Input]: Found input driver: "switch".
[INFO] [Overrides]: Redirecting save file to "/retroarch/cores/savefiles/NES USA/FCEUmm/Back to the Future (U) [!].srm".
[INFO] [Overrides]: Redirecting save state to "/retroarch/cores/savestates/NES USA/FCEUmm/Back to the Future (U) [!].state".
[INFO] [Environ]: SET_CONTROLLER_INFO.
[INFO] [Environ]: GET_VFS_INTERFACE. Core requested version >= V1, providing V3.
[INFO] [Environ]: RETRO_ENVIRONMENT_SET_CONTENT_INFO_OVERRIDE.
[INFO] [Content Override]: File Extension: 'fds' - need_fullpath: FALSE, persistent_data: FALSE
[INFO] [Content Override]: File Extension: 'nes' - need_fullpath: FALSE, persistent_data: FALSE
[INFO] [Content Override]: File Extension: 'unf' - need_fullpath: FALSE, persistent_data: FALSE
[INFO] [Content Override]: File Extension: 'unif' - need_fullpath: FALSE, persistent_data: FALSE
[INFO] [Environ]: GET_LOG_INTERFACE.
[INFO] [Environ]: SET_SUPPORT_ACHIEVEMENTS: yes.
[INFO] [Environ]: GET_MESSAGE_INTERFACE_VERSION.
[INFO] [Environ]: GET_LANGUAGE: "0".
[INFO] [Content]: Loading content file: "/Roms/NES USA/Back to the Future (U) [!].nes".
[INFO] [Environ]: RETRO_ENVIRONMENT_GET_GAME_INFO_EXT.
[INFO] [Environ]: SET_PIXEL_FORMAT: RGB565.
[libretro INFO] Frontend supports RGB565 - will use that instead of XRGB1555.
[INFO] [Environ]: PERFORMANCE_LEVEL: 5.
[INFO] [Environ]: SYSTEM_DIRECTORY: "/retroarch/cores/system".
[INFO] [Environ]: GET_CORE_OPTIONS_VERSION.
[INFO] [Environ]: GET_LANGUAGE: "0".
[INFO] [Environ]: RETRO_ENVIRONMENT_SET_CORE_OPTIONS_V2_INTL.
[INFO] [Environ]: SET_INPUT_DESCRIPTORS:
[INFO] [Environ]: SET_MEMORY_MAPS.
[INFO] [Replay]: Found last replay slot: #0
[INFO] [SRAM]: Skipping SRAM load.
[INFO] [Core]: Version of libretro API: 1, Compiled against API: 1
[INFO] [Core]: Geometry: 256x224, Aspect: 1.306, FPS: 60.10, Sample rate: 48000.00 Hz.
[INFO] [Audio]: Set audio input rate to: 47872.40 Hz.
[INFO] [Video]: Set video size to: 879x672.
[INFO] [Video]: Starting threaded video driver..
[INFO] [EGL] Falling back to eglGetDisplay
[INFO] [EGL]: EGL version: 1.4
[INFO] [GL]: Found GL context: "egl_switch".
[INFO] [GL]: Detecting screen resolution: 1280x720.
[INFO] [EGL]: Current context: 0x56de6c4a0.
[INFO] [GL]: Vendor: nouveau, Renderer: NV120.
[INFO] [GL]: Version: 4.3 (Compatibility Profile) Mesa 20.1.0-rc3.
[INFO] [GL]: Using resolution 1280x720.
[INFO] [GL]: Default shader backend found: glsl.
[INFO] [Shader driver]: Using GLSL shader backend.
[INFO] [GLSL]: Checking GLSL shader support ...
[WARN] [GL]: Stock GLSL shaders will be used.
[INFO] [GLSL]: Found GLSL vertex shader.
[INFO] [GLSL]: Found GLSL fragment shader.
[INFO] [GLSL]: Linking GLSL program.
[INFO] [GLSL]: Found GLSL vertex shader.
[INFO] [GLSL]: Found GLSL fragment shader.
[INFO] [GLSL]: Linking GLSL program.
[INFO] [GLSL]: Found GLSL vertex shader.
[INFO] [GLSL]: Found GLSL fragment shader.
[INFO] [GLSL]: Linking GLSL program.
[INFO] [GL]: Using 4 textures.
[INFO] [GL]: Loaded 1 program(s).
[INFO] [GL]: Using GL_RGB565 for texture uploads.
[INFO] [Video]: Graphics driver did not initialize an input driver. Attempting to pick a suitable driver.
[INFO] [Joypad]: Found joypad driver: "switch".
[INFO] [Video]: Found display server: "null".
[INFO] [Audio]: Using libnx_audren_thread driver
[INFO] [Audio]: real_latency is 64
[INFO] [Audio]: Started synchronous audio driver.
[INFO] [Display]: Found display driver: "gl".
[libretro INFO]  Player 1: Gamepad
[libretro INFO]  Player 2: Gamepad
[libretro INFO]  Player 3: None Connected
[libretro INFO]  Player 4: None Connected
[libretro INFO]  Famicom Expansion: None Connected
[INFO] [Playlist]: Loading history file: "/retroarch/content_history.lpl".
[INFO] [Playlist]: Loading history file: "/retroarch/content_music_history.lpl".
[INFO] [Playlist]: Loading favorites file: "/retroarch/content_favorites.lpl".
[INFO] [State]: Loading state "/retroarch/cores/savestates/NES USA/FCEUmm/Back to the Future (U) [!].state.auto", 0 bytes.
[ERROR] [State]: Failed to load state from "/retroarch/cores/savestates/NES USA/FCEUmm/Back to the Future (U) [!].state.auto".
[INFO] [Config]: Saving salamander config to: "/retroarch/retroarch-salamander.cfg".
[INFO] [Config]: Saving salamander config to: "/retroarch/retroarch-salamander.cfg".
[INFO] [Config]: Saved new config to "/retroarch/retroarch.cfg".
[INFO] Auto save state to "/retroarch/cores/savestates/NES USA/FCEUmm/Back to the Future (U) [!].state.auto" succeeded.
[INFO] [Config]: Saving salamander config to: "/retroarch/retroarch-salamander.cfg".
[INFO] [Config]: Saving salamander config to: "/retroarch/retroarch-salamander.cfg".
[INFO] [Config]: Saved new config to "/retroarch/retroarch.cfg".
[INFO] [Core]: Content ran for a total of: 00 hours, 00 minutes, 08 seconds.
[INFO] [Runtime]: Saving runtime log file: "/retroarch/playlists/logs/FCEUmm/Back to the Future (U) [!].lrtl".
[INFO] [Core]: Unloading game..
[INFO] [Core]: Unloading core..
[INFO] [Core]: Unloading core symbols..
[INFO] [Core]: Saved core options file to "/retroarch/config/FCEUmm/FCEUmm.opt".
[INFO] Threaded video stats: Frames pushed: 6880, Frames dropped: 11.