Brewing Stand doesn't allow items to be dropped in the reagent slot.

Similar issue - MCPE-59242
 
 
I created a Brewing Stand recipe (below), but the brewing stand won't let me add brown mushroom as a reagent.
 
{
  "format_version": "1.13.0",
  "minecraft:recipe_brewing_mix": {
    "description": 

{       "identifier": "kohldar_micro_brew:yeast_culture"     }

,
    "tags": [
      "brewing_stand"
    ],
    "input": "minecraft:potion",
    "reagent": "minecraft:brown_mushroom",
    "output": "kohldar_micro_brew:yeast_culture"
  }
}