It seems this is a thing when there's less than a buckets worth of creosote oil inside the coke oven. I place 2 or more glass bottles in the coke oven's slot for filling bottles and what have you with creosote, and it'll "use" 1 glass bottle and produce two new empty bottles in the results slot. This gives me 3 glass bottles, and I can keep repeating this process for infinite glass bottles. If I put a full stack of glass bottles in the top slot, it'll use one and give me 64 back.

Duplicate of #593

My apologies. Didn't think to look at the closed reports.