Hello, i try to get a spawn egg from the mobs so i I increased the % value to 99% and it still didn't drop an egg after about 100 mobs nut everytime when i set the value on 100% it dropped everytime can somebody help me with it?

I've tested with latest forge and fabric mod versions and can not reproduce your issue. In the spawnermod.json file I'm changing the field: "monster_egg_drop_chance": 100, which makes an egg drop each time a mob dies.