How can i fix that player do get hungry while this is on?

[drifting furnace]

Every 10 seconds:
If player if flying:
Set saturation of player to 20

[wraith garden]

That doesn't work or i'm doing it wrong

[drifting furnace]

Sorry yo need to loop all players

Loop all players;
If loop-player is flying:
Set saturation of loop-player to 20

[quick grotto]

or just do it on the flight toggle event while they are flying....

also, they want players to get hungry

your suggestion is the opposite lol