EMI indicates in the recipe that an item has a probability (here 50%) for the recipe (here cutting board) as an output. But in the recipe tree it doesn't show ~8 (4/50%) wild rice like in the fabric version.

Installed mods:
EMI 1.1.0+1.20.1+forge
Create 1.20.1-0.5.1.f
JEI 15.3.0.1
Farmer's Delight 1.20.1-1.2.4

Create forge also doesn't implement an EMI plugin to communicate chance

This is a bug with farmer's delight

No, Create also doesn't work

Both mods use "chance" in the recipe JSON files to get this item only at the defined percentage

Create example:
{
"type": "create:crushing",
"ingredients": [
{
"item": "minecraft:gravel"
}
],
"processingTime": 250,
"results": [
{
"item": "minecraft:sand"
},
{
"chance": 0.1,
"item": "minecraft:flint"
},
{
"chance": 0.05,
"item": "minecraft:clay_ball"
}
]
}

Farmer's Delight example:

{
"type": "farmersdelight:cutting",
"ingredients": [
{
"item": "farmersdelight:wild_rice"
}
],
"result": [
{
"item": "farmersdelight:rice"
},
{
"chance": 0.5,
"item": "farmersdelight:straw"
}
],
"tool": {
"tag": "forge:tools/knives"
}
}

EMI just cannot handle the "chance" for its recipe tree calculations.

Vanilla has no concept of chance, what these mods are doing is adding a tooltip that mentions chance for JEI. JEI has no concept of chance, EMI does. A mod with an EMI plugin can specify its recipes have a chance for consumption/production.