classic_zombies unintentionally removes all map extras

[shadowonwhite]

Describe the bug

{
"type": "region_overlay",
"regions": [ "all" ],
"overmap_feature_flag_settings": { "whitelist": [ "CLASSIC" ] }
},

This seems to require map extras to have the tags too, which none does.

Attach save file

N/A

Steps to reproduce

1.Create world with classic_zombies enabled
2.Try to find a single map extra

Expected behavior

do not check map extras for tags

Screenshots

No response

Versions and configuration

OS: Windows
OS Version: 10.0.19045.4529 (22H2)
Game Version: 9568831 [64-bit]
Graphics Version: Tiles
Game Language: System language []
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],
Translate Complex Dialogue [translate_dialogue],
sees-player, run, crouch, bleed icons, retrodays [sees_player_retro],
SpeedyDex [speedydex],
Stats Through Skills [StatsThroughSkills],
Bionic Slots [cbm_slots]

Additional context

Deleting the aforementioned line and reloading the save fixes the problem.

[Procyonae]

Adding the flags where appropriate makes sense in this case, it can either be done in vanilla like it currently does or in the mod itself like I did here when adding a whitelist to Backrooms. (Which personally I feel should be the norm)

Cataclysm-DDA/data/mods/Backrooms/map_extras.json

Lines 24 to 29 in ae7671a

	{
	"id": "mx_casings",
	"type": "map_extra",
	"copy-from": "mx_casings",
	"extend": { "flags": [ "BACKROOMS" ] }
	},

I would also like the whitelist/blacklist flags to be split by type/subtype in region settings bc this makes using whitelists kind of annoying depending what you want but that's a seperate issue