I set the parameter alone and it worked! Using grub cutomizer though GRUB_ENABLE_BLSCFG to false it seems like is not set in the etc/default/grub file, that’s weird. Ihave that to false because I want to set a background image.
GRUB_TIMEOUT="15"
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT="0"
GRUB_DISABLE_SUBMENU="true"
#GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="resume=UUID=90416566-7972-4322-96dc-722d764f06cb rhgb quiet splash"
#GRUB_DISABLE_RECOVERY="true"
GRUB_SAVEDEFAULT="false"
GRUB_GFXMODE="1920x1080"
#GRUB_HIDDEN_TIMEOUT="5"
#GRUB_TERMINAL_INPUT="console"
#GRUB_DISABLE_OS_PROBER="false"
#GRUB_THEME="/boot/grub/themes/megano-grub-fedora/theme.txt"
GRUB_CMDLINE_LINUX_DEFAULT=""
#GRUB_DISABLE_LINUX_RECOVERY="true"
export GRUB_COLOR_NORMAL="light-gray/black"
export GRUB_COLOR_HIGHLIGHT="magenta/black"
GRUB_BACKGROUND="/boot/grub2/themes/system/background.png"
GRUB_ENABLE_BLSCFG="false"
GRUB_CMDLINE_LINUX_DEFAULT="amdgpu.ppfeaturemask=0xfffd7fff"