Items don't merge in AIM, different miners, different `"item_vars":{"activity_var"`

[Brambor]

Describe the bug

Moving items they display this way, not merging:

Opening the save file I found this for coal:

{"typeid":"coal_lump","charges":2891,"bday":7041581,"item_vars":{"activity_var":"Ching Harman, logger"},"owner":"your_followers","last_temp_check":0},
{"typeid":"coal_lump","charges":4927,"bday":6640969,"owner":"your_followers","last_temp_check":0},
{"typeid":"coal_lump","charges":3774,"bday":6891985,"item_vars":{"activity_var":"Jamie Kline"},"owner":"your_followers","last_temp_check":0},

I think it happened because each coal was probably mined by different NPCs in my faction.

• When I move them to a different tile, they don't merge.
• They don't merge after saving and loading.
• I told one of the miners to take it easy and mine again hoping the activity would restart and this item would get stripped of the text and merge. No luck.

Attach save file

Winter Beach-trimmed.tar.gz

• The items are next to the character.
• The mine (with actively mining NPCs) is right next to the player character too.

Steps to reproduce

1. Load attached save.
2. / Open AIM.
3. Observe: unmerged items.

Otherwise, probably:

1. Designate a zone for mining.
2. Let multiple characters mine there (order NPC to mine, mine yourself) until both of you mine coal or probably anything that should show as a single entry.
3. Move the mined items to a single tile.
4. Observe: items didn't merge.

Expected behavior

I expect the items to merge. I don't know why it needs the activity at all. I assume it is a bug.

Screenshots

No response

Versions and configuration

• OS: Windows
  • OS Version: 10.0.19045.4412 (22H2)
• Game Version: 0.G-9792-gaef714a46c-dirty [64-bit] - master was 96401952f5
• 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] ]

Additional context

Workaround:

1. Delete "item_vars":{"activity_var":"Jamie Kline"}, from one of the coals in the save file.
2. Load the game.
3. Move the items back and forth.
4. They correctly merge.

[Brambor]

I searched for "item_vars":{"activity_var":"Ching Harman, **logger"} in that save, it matched 324 items.

Here (disassembly) it seems to be to reserve items during disassembly: https://github.com/CleverRaven/Cataclysm-DDA/blob/26960ee03550dded3ba0123562fb92f8df5228f7/src/activity_actor.cpp#L5165-L5166

Many of the matches are for the logs and sticks I ordered NPCs to chop, which is set here: https://github.com/CleverRaven/Cataclysm-DDA/blob/26960ee03550dded3ba0123562fb92f8df5228f7/src/activity_actor.cpp#L6334-L6348

I already want to do too much. I wish somebody would look at it and say what this is for and if it is safe to delete.

[Brambor]

While AIM window does not merge the items, the V List items menu does merge them. List items:

AIM:

But! V List items menu also doesn't show ! stealing, which might be related.