[2.0.32] MineEntityTechnologyTrigger fires for unknown reason

[thesixthroc]

I received a bug report for [Cerys](https://mods.factorio.com/mod/Cerys-Moon-of-Fulgora) in which the players reported seeing a "mine-entity" research trigger for `cerys-nitrogen-rich-minerals` unlock at an inappropriate time.

Batted it aside, but then I saw it myself in the Comfy Christmas run. It unlocked after Moon Discovery Cerys was researched, before the Cerys surface had even generated.

[Rseding91]

The way the mine entity trigger works is, if the entity is a resource entity then it will also trigger if you collect that resource as a result of mining any entity either manually or with a mining drill.

[thesixthroc]

If my memory serves me correctly, that can't explain the issue.

In Cerys `cerys-nitrogen-rich-minerals` are obtainable only on Cerys — they are not minable from any entity and only spawn via autoplace settings on Cerys, and no other mod places or autoplaces them (I have inspected each mod.) The mine-entity technology became unlocked shortly after Moon Discovery Cerys, and before anyone had tasked a space platform to travel towards Cerys.

I have no repro — just my memory and a similar earlier bug report I received from a player.

[thesixthroc]

Note also this bug report in the Maraxsis discord:

> Hello, I’m not sure what triggered it exactly, but the researches of submarine automation and tungsten pipelines unlocked while I was clearing ruins on Fulgora.

[Rseding91]

I’d need a way to reproduce any issue in order to look into this more.

[elmbald]

I couldn't upload my save through this forum, but here's a link to a save a few seconds before triggering this bug, this time an issue in a trigger tech for Moshine which got researched instantly after researching the planet. Looking at the global statistics, this tech should not have been triggered (never mined mixed ores)

https://drive.google.com/file/d/1CWfd0q ... sp=sharing

[Rseding91]

I couldn't upload my save through this forum, but here's a link to a save a few seconds before triggering this bug, this time an issue in a trigger tech for Moshine which got researched instantly after researching the planet. Looking at the global statistics, this tech should not have been triggered (never mined mixed ores)

https://drive.google.com/file/d/1CWfd0q ... sp=sharing

This is the exact case I already mentioned:

the multi-ore produces several different items and if *any* of those items are in production statistics the game treats it as if that multi-ore has been mined for the purpose of the mine-entity technology trigger.

multi-ore produces coal, copper-ore, sulfur, sand, and neodynmium. You are mining coal and so as far as it knows, that coal could have come from multi-ore.

It works this way as a performance saving measure: producing events every time a resource entity is mined by any drill, and iterating all mine-entity technology triggers would have way too much performance overhead.

It's unfortunate because it means modded cases like this just won't function with the technology triggers.