Can not save core option and game-options file size is zero (blank)

Using Odroid N2 with TheRA, it is normal.
But Odroid XU4 with TheRA, I meet the same issue ( with RetroPie) as the following link :
https://retropie.org.uk/forum/topic/21796/lr-parallel-n64-game-options-file-blank

there are 3 options in retroarch-core-options.cfg

parallel-n64-gfxplugin = "rice"
parallel-n64-gfxplugin-accuracy = "veryhigh"
parallel-n64-screensize = "640x480"

you can manual edit it, for example change "rice" to "glide64" and it will work.
But if you change it in RetroArch and save it as default core option ( override core option ),
it will not take effect.
If you save game option to file, the .opt file size is zero.

Is it due to permission issue or something not found, hope it can be fixed,
thank you !

P.S.
may I ask If I set GFX Plugin to "auto",
is there a config file to define which rom to use which plugin ?
Or it choose plugin by "program auto detect" ?
Sometime the "auto" seems not choose the best plugin.
Thank you.

Reproduce the zero-byte .opt file and failed core-option save on an Odroid XU4 with TheRA and RetroPie, comparing them with the working Odroid N2 case. Start with retroarch-core-options.cfg and the referenced game-options files; done means saved core and game options persist and the plugin-selection behavior is understood.