What happened with this mod?

Very little interest in the mod. The code verses the use ratio is too much, not really worth maintaining.

I used it =)

You can continue to use it, it won't go away. And for you, if you find another bug, I will do my best to fix it.

Is it intended to not get any used canisters when using rocket/nuclear fuel for vehicles or heating towers?

In a previous version, canisters were returned when rocket/nuclear fuel was burned as fuel. However, a fundamental flaw in the mod was discovered, which eventually caused me to deprecate the mod. Due to the high productivity bonuses possible for rocket fuel, you could create too many canisters. When one canister makes more than one rocket fuel and then burned as fuel, you have more canisters than you began with.

Alright, satisfied my curiosity, ty

Can you consider adding a setting in the mod options to enable it, and having it be something like a 20% chance or so to get a used canister back? I was a little bummed when I realised I wasn't getting any used canisters and was kinda looking forward to the logistics of it. Though if you don't wanna, that's completely fine

Unfortunately, I do not see a way to adjust the burnt results for the fuel. But I could use the refurbishing recipe to accomplish the same effect. More returned canisters in, than canisters out.

That's also a good idea, just something like the fuel burning hot enough to ruin the canisters so you need multiple to make a new one lol

Version 0.4.0 has been uploaded. There is now a startup setting for the refurbishing recipe results, minimum number of canisters produced, default: 5.
So the results of the refurbishing will vary between the number you set, and the maximum of 10.

You will need to pick up the furnaces/heating towers/vehicles and replace them, so they will have the burnt fuel slots.