The `flower_default` and `flower_warm` features generate a single flower, instead of a flower patch

Due to changes in how flower patches generate in 26.1 Pre-Release 1 (removal of flower, flower_no_bonemeal, and random_patch feature types) flower_default and flower_warm features stopped generating in patches and instead attempt to place either a single poppy or a single dandelion.

Steps to reproduce:

You can reproduce this bug by creating a new world with any seed and looking around for flower patches. Here’s the quick way to get to the flower patch shown on the attached screenshots:

1. Open two instances of Minecraft - one with the latest version where the bug still applies (26.1.2 or 26.2-pre-3 as of writing this) and another with version 1.21.11.

2. On both instances create a new world with this seed: -2112823735615928803 and set your gamemode to creative.

3. On both instances run this command: /execute in minecraft:overworld run tp @s 1374.77 65.37 -2281.68 149.85 42.75

Result:

On the instance with the latest version of Minecraft you can see a single dandelion on the ground. On the instance with version 1.21.11 you can see a patch of poppies and dandelions. 1.21.11 is the intended behavior here.

Possible fixes:

1. The first fix is to revert the flower patch generation for flower_default and flower_warm to how it was in 1.21.11.
   To do that, add these placement rules to data/minecraft/worldgen/placed_feature/flower_default.json and data/minecraft/worldgen/placed_feature/flower_warm.json:

   {
     "type": "minecraft:count",
     "count": 64
   },
   {
     "type": "minecraft:random_offset",
     "xz_spread": {
         "type": "minecraft:trapezoid",
         "max": 7,
         "min": -7,
         "plateau": 0
       },
     "y_spread": {
         "type": "minecraft:trapezoid",
         "max": 3,
         "min": -3,
         "plateau": 0
       }
   },
   {
     "type": "minecraft:block_predicate_filter",
     "predicate": {
        "type": "minecraft:matching_block_tag",
        "tag": "minecraft:air"
       }
   }

2. Since MC-238711 is marked as Confirmed, I propose another fix that makes flower_default and flower_warm generate in random patches of a single flower type (poppies or dandelions) instead of patches of both poppies and dandelions in one patch.
   To do that, don’t touch any files under data/minecraft/worldgen/placed_feature/. Instead, replace the code inside data/minecraft/worldgen/configured_feature/flower_default.json with this one:

   {
     "type": "minecraft:random_selector",
     "config": {
       "features": [
         {
           "chance": 0.33333334,
           "feature": {
             "feature": {
               "config": {
                 "to_place": {
                   "type": "minecraft:simple_state_provider",
                   "state": {
                     "Name": "minecraft:dandelion"
                   }
                 }
               },
               "type": "minecraft:simple_block"
             },
             "placement": [
               {
                 "type": "minecraft:count",
                 "count": 64
               },
               {
                 "type": "minecraft:random_offset",
                 "xz_spread": {
                   "type": "minecraft:trapezoid",
                   "max": 7,
                   "min": -7,
                   "plateau": 0
                 },
                 "y_spread": {
                   "type": "minecraft:trapezoid",
                   "max": 3,
                   "min": -3,
                   "plateau": 0
                 }
               },
               {
                 "type": "minecraft:block_predicate_filter",
                 "predicate": {
                   "type": "minecraft:matching_block_tag",
                   "tag": "minecraft:air"
                 }
               }
             ]
           }
         }
       ],
       "default": {
         "feature": {
           "config": {
             "to_place": {
               "type": "minecraft:simple_state_provider",
               "state": {
                 "Name": "minecraft:poppy"
               }
             }
           },
           "type": "minecraft:simple_block"
         },
         "placement": [
           {
             "type": "minecraft:count",
             "count": 64
           },
           {
             "type": "minecraft:random_offset",
             "xz_spread": {
               "type": "minecraft:trapezoid",
               "max": 7,
               "min": -7,
               "plateau": 0
             },
             "y_spread": {
               "type": "minecraft:trapezoid",
               "max": 3,
               "min": -3,
               "plateau": 0
             }
           },
           {
             "type": "minecraft:block_predicate_filter",
             "predicate": {
               "type": "minecraft:matching_block_tag",
               "tag": "minecraft:air"
             }
           }
         ]
       }
     }
   }

I’ve attached Data Packs that apply these fixes, so you can test both of them out.