Friendly monsters don't fight back against enemies if you're adjacent to them

[chaosvolt]

Describe the bug

Exactly what it says on the tin. I just happened to notice that a summon glyph I was using was sitting there and ignoring enemies that were actively slapping it around, and soon found the odd behavior kicked in when I was standing next to it. After testing I soon found vanilla monsters do this too, it isn't just a result of the PRIORITIZE_TARGETS flag nor is it from the monster counting as a pet.

Steps To Reproduce

1. Spawn in and successfully activate an inactive manhack.
2. Box it in so it's forced to hover next to you.
3. Summon a zombie next to it.
4. Wait, observe the manhack takes the beating without retaliating.
5. Step away from the manhack and watch as it finally remembers it is a spicy lil robot covered in knives.

Screenshots

Versions and configuration

• OS: Windows
  • OS Version: 10.0.19041.450 (2004)
• Game Version: 02e1090 [64-bit]
• Graphics Version: Tiles
• LAPI Version: 2
• Game Language: []
• Mods loaded: [ Bright Nights [bn], Arcana and Magic Items [Arcana], Cataclysm++ [Cata++], Medieval Mod Reborn [Medieval_Mod_Reborn], MST Extra [MST_Extra], Arcana/Cata++ Patchmod [Arcana_Cata++_Patch], Mining Mod [Mining_Mod], Tankmod: Revived [Tankmod_Revived], No Fungal Monsters [No_Fungi], Disable NPC Needs [no_npc_food], Faster Stamina Regen [stamina_regen_buff], Manual Bionic Installation [manualbionicinstall], Simplified Nutrition [novitamins], Stats Through Kills [stats_through_kills] ]

Additional context

No response

[chaosvolt]

New discovery:

It seems to be related to the HIT_AND_RUN flag, but with the added complication that removing the flag via copy-from doesn't seem to work right for the sake of this bug. The monster I first encountered this bug with, summoned hunting horrors in Arcana, inherits from a HIT_AND_RUN monster but deletes the flag: https://github.com/chaosvolt/cdda-arcana-mod/blob/master/Arcana_BN/monsters/monsters.json#L587

I can confirm that summoned hunting horrors don't actually exihibit hit-and-run behavior however so it SHOULD be getting deleted properly.