Problem with the `WATERPROOF` flag

Describe the bug

According to the documentation:
https://github.com/CleverRaven/Cataclysm-DDA/blob/7483759b4225970c793a30dca96b35619cc17dfb/doc/JSON_FLAGS.md?plain=1#L248

So if I create a clothing with 100% body coverage and jump into the water, I'll stay dry?

I created:

"covers": [ "head", "torso", "leg_l", "leg_r", "arm_l", "arm_r", "foot_l", "foot_r", "mouth", "eyes", "hand_l", "hand_r" ],

[
  {
    "id": "test_suit",
    "type": "ARMOR",
    "name": { "str": "TEST suit" },
    "description": "TEST",
    "weight": "4000 g",
    "volume": "14 L",
    "price": "1 kUSD 175 USD",
    "price_postapoc": "20 USD",
    "material": [ "kevlar" ],
    "symbol": "[",
    "looks_like": "armor_riot",
    "color": "brown",
    "armor": [
      {
        "material": [
          { "type": "kevlar", "covered_by_mat": 100, "thickness": 2 }
        ],
        "covers": [ "head", "torso", "leg_l", "leg_r", "arm_l", "arm_r", "foot_l", "foot_r", "mouth", "eyes", "hand_l", "hand_r" ],
        "coverage": 100,
        "encumbrance": [ 7, 7 ]
      }
    ],
    "warmth": 40,
    "environmental_protection": 20,
    "flags": [ "VARSIZE", "RAINPROOF", "STURDY", "WATERPROOF" ]
  }
]

And dived underwater. Everything's great. My body is completely dry.

But if I remove one glove (for example: "hand_r").

"covers": [ "head", "torso", "leg_l", "leg_r", "arm_l", "arm_r", "foot_l", "foot_r", "mouth", "eyes", "hand_l" ],

I get the following situation:

Every part of my body became either damp or soaked.

So I am assuming that this flag is not being handled correctly. Or it needs to have its description (including game description) corrected.

Attach save file

n/a

Steps to reproduce

1. Create test armor / modify existing armor (rm13)
2. Find a river
3. Dive under the water
4. See which parts of your body are wet

Expected behavior

The operation of the flag according to its description.

Screenshots

No response

Versions and configuration

• OS: Windows
  • OS Version: 10.0.19043 (21H1)
• Game Version: cdda-experimental-2024-08-28-0630 3484533 [64-bit]
• Graphics Version: Tiles
• Game Language: English [en]
• Mods loaded: [
  Dark Days Ahead [dda],
  Disable NPC Needs [no_npc_food],
  Portal Storms Ignore NPCs [personal_portal_storms],
  Slowdown Fungal Growth [no_fungal_growth],
  XXX [XXX]
  ]

XXX = mod for armor test (a couple of json files)

Additional context

No response

Start with the referenced doc/JSON_FLAGS.md entry for WATERPROOF and reproduce the behavior using the test armor JSON described in the issue. Compare full body coverage with the version missing hand_r, then trace the wetness behavior until the flag's documented meaning is explained; done means the implementation and description agree, or the mismatch is documented clearly.