SPAWN_GROUP spell effect doesn't work with item_group

[GuardianDll]

Describe the bug

SPAWN_GROUP spell effect doesn't work with item_group, even when the doc says the opposite

Steps to reproduce

1. Copypaste the json below

  {
    "id": "innamagic_animsit_scroll_spawn",
    "type": "SPELL",
    "name": "Spawn Animist Scroll",
    "description": "Spawns a random animist scroll from group.",
    "valid_targets": [ "self" ],
    "min_damage": 1,
    "max_damage": 1,
    "effect": "spawn_item",
    "effect_str": "animist_scrolls",
    "shape": "blast",
    "min_duration": 17280000,
    "max_duration": 69120000,
    "flags": [ "SPAWN_GROUP", "SILENT", "RANDOM_DURATION" ]
  },
  {
    "type": "item_group",
    "id": "animist_scrolls",
    "items": [
      { "item": "spell_scroll_banishment_lesser", "prob": 100 },
      { "item": "spell_scroll_bleed", "prob": 100 },
      { "item": "spell_scroll_boneclub", "prob": 100 },
      { "item": "spell_scroll_disruption_bolt", "prob": 100 }
    ]
  }

2. Cast a Spawn Animist Scroll spell
3. Find it triggers error, and spawn undefined-animist_scrolls item

Expected behavior

Spawn a random item from loot group
Same ability for EoC would be also good (especially good if there would be a counter to not repeat himself)

Screenshots

DEBUG    : Missing item definition: animist_scrolls

FUNCTION : find_template
FILE     : D:\a\Cataclysm-DDA\Cataclysm-DDA\src\item_factory.cpp
LINE     : 2367
VERSION  : 26a4725

Versions and configuration

• OS: Windows
  • OS Version: 10.0.19044.2130 (21H2)
• Game Version: 26a4725 [64-bit]
• Graphics Version: Tiles
• Game Language: English [en]
• Mods loaded: [
  Dark Days Ahead [dda],
  Disable NPC Needs [no_npc_food],
  No Fungal Growth [no_fungal_growth],
  Bionic Professions [package_bionic_professions],
  Magiclysm [magiclysm],
  Xedra Evolved [xedra_evolved],
  Mythical Martial Arts [MMA]
  ]

Additional context

No response

[ZhilkinSerg]

Item spawn from item group was not implemented as mentioned in #40656. Someone is yet to do that.

[github-actions]

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