Steps to reproduce:
Use the mod I attached. Place 2 electric poles and connect them with red or green wire. Then press Ctrl+Z. The floating text states that the connection was undone, but no chat message.

When I disconnect a wire connection by script the next tick after it was connected and I want ...

I figured out that the tiles of the other planets do not use the elevation variable inside map_gen_settings. If you check planet-fulgora-map-gen.lua and tiles-fulgora.lua (other planets accordingly), you see that the usey a funny mix of everything.

Even modifying the "fulgora_elevation" property to ...

Relating to https://www.factorio.com/blog/post/fff-402. When using set_blueprint_entities, even without modifying anything, it forgets those wire connectiong going to external entities.

script.on_event(defines.events.on_player_setup_blueprint, function(event)
local item = event.record or event ...

Maybe https://lua-api.factorio.com/latest/eve ... gui_opened?

Usually, techs "disappear" when there are modified/replaced by a mod, which is subsequently deactivated.
If you started playing with a mod that changed or removed the tech, and decided to deactivate that mod, then you get this result.

Can't guarantee it's the root cause though.

[Edit] : This ...

What do you want to achieve exactly?

You can also run migration code in the on_configuration_changed event after checking if the buggy version of your mod was NOT installed

Also pyrawores does that with e.g. aluminium rock. It's basically a very low spawning probability

Keithen wrote: Sun Sep 14, 2025 7:39 pm What do you mean by "turned off"?

Disable iron before generating the map

You should use some regex for the string which will be replaced. In the base game, the rq values are 1.10, not 0.11.

Did you manage to generate copper at the same spots as iron, but with iron turned off?

Collision mask is the way to go, what did you do so far?

Alternatively use x+y*524288 :)
Since the game stores positions as fixed 32-bit numbers with 8 bits for decimal precision, that means the maximum map coordinate is 2^24. A chunk has 32 or 2^5 tiles, dividing one by the other would give a value large enough for every chunk in the game. 2^24/2^5 = 2 ...

Maybe https://lua-api.factorio.com/latest/pro ... multiplier?

It can be in the cursor_stack, but doesn't have to . It could be in the cursor, but also in inventory, or in another entity.
What i'm think of for the solution is in the on_gui_opened event, if the opened gui is of type blueprint, save the blueprint that you can get from player.opened, and if the ...

Don't know if this is intended, but it breaks functionality of my mod:
When using force_generate_chunk_requests inside the on_surface_created event, the on_chunk_generated event is executed for all mods before all other mods execute on_surface_created.
In my example I assign a surface property in on ...

How to access the ItemStack or Record holding the blueprint configured in on_player_configured_blueprint?
It's not blueprint_to_setup or cursor_stack

You are wrapping defines.events.xxx in parentheses, thus providing a table when the on_event function expects a defines.events number or a string of the same name. Remove the {} and it should work. (assuming radars even have gui, i don't remember if they do with energy sources other than burner ...

Similar to the Electric Energ Interface, a Beacon Interface would be nice which allows to arbitrarily set the effects runtime without dealing with module items.
Alternatively or in addition, allow machines that are effect receivers to apply effects on them during runtime

Here are the save file and the mod (Do not sync mods). Just guide the train trough the subway.

There are more hints now and the savefile does only contain one mod

47.841 Error CrashHandler.cpp:503: Exception Code: c0000005, Address: 0x00007ff60b88e491
ModuleBase: 0x00007ff60b4e0000, ImageSize: 029be000, RelativeAddress: 003ae491
47.841 Error CrashHandler.cpp:509: Access Violation: Read at ...