Okay, i couldn't find a forum for marathon, but I found the github repo for it, and have added a workaround which just disables the gas-canister update. Needs it to be accepted/merged now though. Who knows if/when that will happen.

Now, if this is a required change, then I may have to go ahead and change it, however, the issue is not in my mod. IE, if "Recipe.select" is erroring, then it isn't my issue, as that isn't my function. So... ask at Marathon Mod's forum. If they suggest I rename my canister, then I will, but ...

HI, I posted this in the main bug report forum yesterday, but apparently it's not a problem with Factorio itself.

The basic problem is that when I use marathon with bobs, I find that making bottled petroleum gas has steel beams as its ingredients, not petroleum and empty bottle, as I expect.

When ...

I am able to make bottled petroleum gas from steel, instead of from empty bottle and petroleum.

I think I know the problem.

bobplates 0.14.0 creates a recipe named "petroleum-gas-canister", meanwhile, marathon (1.1.5) does a Recipe.select on "gas-canister" and updates the ingredients to be steel x ...

Apologies for being a little vague, I wasn't going to report this trivial issue I noticed last night at all, untill I happened across the bug reports on this forum, and this is all from memory. I suspect there is nothing subtle I'm doing to cause this one and that it is straight forwards, as below ...