The mutations for the botania white plant is invalid. It should reference vanilla:wheat_plant and vanilla:melon_plant. The vanilla prefix is missing

mutation file:
https://github.com/Filostorm/Multiblock-Madness/blob/master/config/agricraft/json/defaults/mod_botania/mutations/botania_white_mutation.json

see corrected file in AgriPlants repo:
https://github.com/AgriCraft/AgriPlants/blob/1.12.2/mod_botania/mutations/botania_white_mutation.json

log file:
[00:13:12] [Client thread/INFO]: Invalid Mutation: Invalid Parent 1: "wheat_plant"!

Mutation:
- Parents:
- Parent 1: wheat_plant
- Parent 2: melon_plant
- Child: botania:white_flower_plant
- Chance: 0.5

[00:13:12] [Client thread/INFO]: Invalid Mutation: Invalid Parent 2: "wheat_plant"!

Mutation:
- Parents:
- Parent 1: botania:white_flower_plant
- Parent 2: wheat_plant
- Child: botania:yellow_flower_plant
- Chance: 0.5

Botania white petal seeds now have their own custom recipe in the TC cauldron, so it should be fixed now.

It also appears you've accidentally gotten a copy of botania's mutations and soils mixed in with mystical world folder, duplicating them

https://github.com/Filostorm/Multiblock-Madness/tree/master/config/agricraft/json/defaults/mod_mysticalworld/mutations

It's honestly weird how much I've had to do to get agricraft working