may iba pong gsi na merong me.phh.superuser pwede nyo po iremove yung buong app directory via termux, twrp recovery terminal or via adb shell(twrp recovery mode habang nakasaksak sa pc/laptop), nasa may bandang /system/app po siguro makikita yun. may naiwan din po sigurong su binary yan, nasa bandang /system/xbin/su ireremove lang po. stick lang po sa magisk and iremove nalang yung supersu.
may feature si magisk na pwede ihide yung magisk app under different package id. at pwede ilagay yung app na nakakadetect ng root via DenyList, try nyo po kung gumagana sya. pag ayaw parin siguro po palit GSI na ang solusyon jan or try nyo po ireflash yung stock system image/bin file then erase/flash userdata,metadata and cache partition then try ulit yung method ni magisk.