I want to switch all my furnaces to higher quality for better crafting speed. With the missing reverse of them, my storage chests will run full. Can you please add them (sub_group=smelting or so?) to your mod?

Assuming you mean smelting plates with Quality Modules, then recycling the plates back into ores with Reverse Factory, then re-smelting the plates again, in order to get higher quality materials, that loop is already possible.

By default, this requires a T3 Reverse Factory, though this can be changed to allow recycling of intermediates (including plates) at all tiers, by changing the "Level of balance" setting to either "no balance" or "user defined". If you only want to change this one property, then set it to "user defined" and change the "Gated intermediate products recycling" setting to Disabled.

If you instead meant recycling the furnaces themselves, in order to re-craft in an assembling machine, in order to get higher quality furnaces, then that is possible at any tier.

If the way I've stated it here isn't the way things are working for you, then there might be a conflicting mod that is removing or overriding base game recipes.

Here reversing furnaces (electric/steel) strangely doesn't work. Nor I can manually insert them (no matter which quality) neither an inserter does it.

local itemTypes = {} here the type="furnace" is missing. I add it now and see if it does work. The furnaces have no damage, btw. .

EDIT: No, I guess that are two different types?

EDIT2: Ah, subgroup="smelting-machine", buttype="item"is allowed in initemTypes`? Hmm, strange.

I'm not sure what you mean, but with vanilla or space age (latest v2.0.42) and Reverse Factory (v9.0.22), everything works exactly as I've described. You may have another mod affecting either the recipes or the items and somehow rendering them non-recyclable (which you can check by hovering over the furnaces in question, either in the Factoripedia or the crafting menu, and there should be a list of mods affecting that item/recipe)

If you're inspecting my data-final-fixes looking for errors, you won't find any that easily, because as I said, the mod works perfectly as I've described, when playing with only vanilla. The list of "itemTypes" you see on lines 68-69 of data-final-fixes are the internal names of the data tables for all "items" in the game, most of which simply fall under the "item" table. The only exceptions to this are the obvious ones you can see there ("ammo" for ammo, "gun" for weapons, "item-with-entity-data" for vehicles and spidertrons, etc.)

If you don't even understand that much about how the data tables work internally, then there's no point in you snooping around in my code, looking for bugs that you would be unable to properly identify. I've been actively working on this mod for several years at this point, so please don't insult me by checking something so blatantly obvious as if I've forgotten to add furnaces to the list of recycling recipes.

Regardless, as I've stated in my first response, I strongly believe there is another conflicting mod that is messing with the base game recipes, so you should start looking at your modlist before checking if my mod is broken.

Ah, you play experimental version, I run stable here. Please read my text again. Steel/electric furnaces themselves cannot be reversed back to their ingredients.

v2.0.42 is the latest stable version of Factorio, as of today; I only play on the stable version as well.

Are you confirming that you are not running any other mods, apart from this and the base game/space age? This is the third time I have asked if you have any other mods affecting the game, aside from Reverse Factory.

If you aren't running any other mods, and are still getting the issue, then try verifying your installation through Steam (or redownloading the game from the website, if you're playing it that way), because if the mod works for me (and likely countless others, considering how many hundreds of people actively are using this mod, and not reporting any issues) and not for you, then the problem must be on your end, and something you've done, not something I can fix for you.

Then that version is not available through Factorio itself. I don't play it with Steam, I bought it directly from Wuwe.

Regardless, I also tested this functionality when you first reported the issue, on what I believe was v2.0.32, the previous stable version.

I also bought Factorio through the Wube website, but they offer free Steam codes for those who did, so that's not really an explanation as to why you don't have a copy on Steam (nor is that knowledge relevant to the conversation at hand).

If you aren't running any other mods, and are still having the issue, then your copy of the game must be broken, so redownload/reinstall through the website, as previously requested.

Ah, 2.0.42 is available on factorio.com as stable, too: https://factorio.com/download I just wondered why the game itself doesn't find any updates as it worked before. I guess Space Age is blocking it. Sorry, I cannot disable other mods, then my game isn't playable as furnaces, assemblers, chemical plants, inserters, drills and many more come from mods (Better Belts, FE+).

I had to copy the "CD key" from gog.com (where I bought both) to my Factorio account. Now I can download the latest update.

The modded furnaces from FE+ (fixed by me) are reversible, not the base (generic) electric/steel furnaces.

Thank you for providing the name of a mod, so I can at least begin looking into compatibility issues.

By FE+, do you mean Factorio Extended Plus? The only 2.0 version being this mod, which appears to be a library, not a playable mod itself? When you say "fixed by me", do you mean you have a private version of Factorio Extended Plus that you have updated to work with 2.0?

If this is the case, then I can't actually test for compatibility, so I suppose you're on your own, because without a copy of that mod, I don't know what I need to do to fix it. I still suspect that whatever mods you have enabled are what is causing the issue, and without any other leads, I can't help you.

Yes, I mean that mod. You can find my repositories here: https://github.com/Quix0r?tab=repositories

Thanks for providing the repo, and bringing us one step closer to a resolution.

I tested with Factorio Extended Plus Core 2.0.4, Machines 2.0.3, Transport 2.0.2, Weaponry 2.0.2, Advanced Electric Revamped 0.7.4, Roboports Extended 0.3.2, and Robot Recall 0.3.3 (which I think is every 2.0 mod in that repository) and could not recreate the issue. There must be another mod apart from these that is affecting the result.

Okay then, thank you so far for your help.