Hello thanks for replies.

I've run into this as a newbie in "New hope" scenario. Placement partially leads to this as stone was quite near to lower furnace belt. Yes using filtered inserter is probably the only option in this case but it's expensive in early stages (later this problem will probably ...

Hello,
I've tried to report the same bug as described here:
https://forums.factorio.com/viewtopic.php?f=11&t=8275&p=319915#p65475

but was advised to create new topic. So here I am.

So description once again:
When having (steel) furnace being fed from belt having two resources, accidental it got ...

Hello,
this bug is still reproducible.

Version: 0.15.40 (build 30950, linux 64, alpha)
Environment: Linux, Ubuntu 16.04 LTS (4.4.0-101-generic)

Please fix it again. This bug is annoying.

Thanks,
Tax